Micro-nano bubble air flotation air dissolving device

Abstract

The utility model discloses a micro-nano bubble air flotation air dissolving device, and belongs to the technical field of sewage treatment devices. Comprising a shell, and a sedimentation tank, a dissolved air tank, a scum cavity and a water outlet tank are arranged in the shell from right to left; the micro-nano bubble generator is arranged on the shell and is used for introducing micro-nano bubbles into the gas dissolving tank; the scraping assembly is arranged on the shell; the scraping plate is mounted on the chain and is driven by the chain to move; the adjusting assembly is arranged on the scraper blade and is used for adjusting the position of the scraper blade according to the height of the water surface in the gas dissolving tank. The micro-nano bubble air flotation air dissolving device has the beneficial effects that the air dissolving tank and the micro-nano bubble generator are arranged, micro-nano bubbles are discharged to the bottom of the air dissolving tank through the micro-nano bubble generator, a scraping motor drives a scraping plate to move, scum on the surface layer of wastewater in the air dissolving tank is scraped, and the air dissolving effect is improved. By adjusting the position of the scraper blade, the lower end of the scraper blade is flush with the wastewater surface, so that the scum is fully scraped.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment equipment technology, and more specifically, to a micro-nano bubble flotation dissolved air device. Background Technology

[0002] Water treatment methods include physical and chemical treatment. Humans have been using water treatment for a considerable period of time, and dissolved air flotation (DAF) is an important method in wastewater treatment. Its principle is to generate a large number of microbubbles in the water using a specific method, forming a three-phase mixture of water, air, and the substances to be removed. Under the combined action of various forces such as interfacial tension, bubble buoyancy, and hydrostatic pressure difference, the microbubbles can adhere to tiny oil droplets or suspended solids in the water, causing them to float to the surface due to their lower density than water, facilitating separation and removal. Dissolved air flotation devices adsorb impurities in wastewater using dissolved air water, which then floats the impurities. Micro-nano bubble dissolved air flotation is a highly efficient water treatment technology that combines the characteristics of traditional dissolved air flotation and micro-nano bubbles. It is widely used in wastewater treatment, solid-liquid separation, oil-water separation, algae removal, and other fields. When treating wastewater using the flotation method, impurities in the wastewater will float on the water surface in the form of scum, which needs to be scraped off by a scraper. However, the height of the wastewater surface will change, which will also change the height of the scum. The scraper is generally fixed, and when the wastewater surface is low, the scraper may not be able to scrape off the scum.

[0003] Therefore, a micro / nano bubble air flotation dissolved air device is needed to solve the above problems. Utility Model Content

[0004] The summary section of this application is intended to provide a brief overview of the concepts, which will be described in detail in the detailed description section below. This summary section is not intended to identify key or essential features of the claimed technical solutions, nor is it intended to limit the scope of the claimed technical solutions.

[0005] To address the technical problems mentioned in the background section, some embodiments of this application provide a micro / nano bubble dissolved air flotation device, comprising: a shell, within which are arranged a sedimentation tank, a dissolved air tank, a scum chamber, and an effluent tank from right to left; the sedimentation tank and the dissolved air tank are separated by a partition, the dissolved air tank and the scum chamber are separated by a partition, and the scum chamber and the partition are separated by a partition; the effluent tank is connected to a pipe extending to the bottom of the dissolved air tank; a micro / nano bubble generator is disposed on the shell and introduces micro / nano bubbles into the dissolved air tank; and a scraper... The component, mounted on the housing, includes: a scraping motor fixed to the housing; two rotating shafts rotatably mounted on the housing and connected to the power end of the scraping motor, with sprockets fixed on the shafts; a chain mounted on the sprockets on the two shafts, the rotation of the shafts driving the chain; a scraper mounted on the chain, the chain driving the scraper to move, the scraper scraping away the scum on the surface of the wastewater in the dissolved air tank and scraping the scum into the isolation plate; and an adjustment component mounted on the scraper, used to adjust the scraper position according to the water level in the dissolved air tank.

[0006] Wastewater is piped into a sedimentation tank, where flocculant is added to cause impurities to settle. A drain pipe connects to the bottom of the sedimentation tank to discharge the settled impurities. A dissolved air tank and a micro-nano bubble generator are also connected. The generator discharges micro-nano bubbles to the bottom of the dissolved air tank, and a scraper driven by a motor removes surface scum from the wastewater into a scum chamber. The treated wastewater from the bottom of the dissolved air tank is then pumped to an effluent tank and discharged. The partition between the dissolved air tank and the sedimentation tank is lower than the depth of the sedimentation tank, allowing wastewater from the upper layer of the sedimentation tank to overflow into the dissolved air tank, while the lower layer containing settled impurities is discharged through a drain pipe and pump connected to the sedimentation tank.

[0007] Furthermore, the adjustment component includes a mounting block, which is mounted on the chain and moves with the chain. The mounting block is provided with a mounting rod that passes through the mounting block. The mounting rod slides with the mounting block, and the lower end of the mounting rod is fixedly connected to the scraper. The mounting rod has multiple limiting grooves distributed along the axis of the mounting rod.

[0008] By using the mounting rod, the scraper position can be adjusted by sliding the rod on the mounting block, so that the lower end of the scraper is flush with the wastewater surface in the dissolved air tank, ensuring that the wastewater is fully scraped away.

[0009] Furthermore, the mounting block is provided with a locking rod that passes through the mounting block. One end of the locking rod is fixedly connected to a locking block that is inserted into the mounting block and embedded in the limiting groove. One end of the locking rod is provided with a retaining ring. A locking spring is connected between the retaining ring and the mounting block. Both ends of the locking spring are fixedly connected to the mounting block and the retaining ring, respectively.

[0010] The locking rod and locking block can be used to position the scraper, preventing it from moving randomly and affecting the removal of scum.

[0011] Furthermore, a fixed plate is fixedly connected to the inner wall of the dissolved air tank, and a push block is fixedly connected to the fixed plate. The push block has an inclined surface. When the mounting block moves with the chain, one end of the locking rod abuts against the inclined surface, causing the locking rod to move along the axis.

[0012] With the fixed plate and the push block set up, when the mounting block and the scraper move to the position of the push block, the locking rod can be pushed by the push block, so that the locking block is no longer embedded in the limit groove, and the scraper can be adjusted at this time.

[0013] Furthermore, a float is installed in the dissolved air tank, and a sliding baffle is fixedly connected to the float. One side of the sliding baffle is in contact with the isolation plate. A connecting block that passes through the fixed plate is fixedly connected to the float. A semi-circular block is fixedly connected to the connecting block. A limiting plate is fixedly connected to the scraper. The position of the limiting plate is adjusted by contacting the curved surface of the semi-circular block.

[0014] With the addition of a float and a sliding baffle, the float can float on the water surface. When the water level in the dissolved air tank changes, the float will move with the water level, which in turn causes the sliding baffle to move. Since the sliding baffle is in contact with the isolation plate, the scum can still be scraped into the scum cavity. At the same time, with the addition of a limiting plate, when the scraper moves to the fixed plate position, it can push the limiting plate under the action of the semi-circular block to adjust the position of the scraper.

[0015] Furthermore, a sliding groove is provided on the connecting block, and a sliding frame is slidably connected in the sliding groove. A second spring is connected between the sliding frame and the end wall of the sliding groove. The two ends of the second spring are fixedly connected to the end wall of the sliding groove and the sliding frame, respectively. A sliding plate is slidably connected in the sliding frame, and evenly distributed limiting blocks are fixedly connected to the sliding plate. A first spring is connected between the limiting block and the sliding frame. The two ends of the first spring are fixedly connected to the sliding frame and the sliding plate, respectively. The limiting block abuts against the fixed plate to limit movement. The limiting block has an inclined surface, so that the limiting block and the fixed plate are unidirectionally limited. When the limiting block extends out of the sliding groove, the fixed plate is located on the movement path of the limiting block, and the connecting block cannot move downward.

[0016] The sliding frame has two states: the first state is close to the fixed plate, and the second state is far from the fixed plate. When in the first state, the second spring is stretched, and the limiting block protrudes from the connecting block and can abut against the fixed plate. When in the second state, the second spring is not stressed, and the sliding plate is in the sliding groove and will not contact the fixed plate.

[0017] Furthermore, a lightweight float head is provided on the lower side of the float block, and a compression spring is connected between the lightweight float head and the float block. A strip with one end inserted into the sliding groove is fixedly connected to the lightweight float head. One end of the strip is set on the inclined surface. When the strip is inserted into the sliding groove, the strip pushes the sliding frame to move, thereby causing the limiting block to extend out of the sliding groove.

[0018] Lightweight float heads can float on the water surface, and when the wastewater level drops, the lightweight float heads will move with the water level.

[0019] The beneficial effects of this application are as follows:

[0020] 1. Through the set dissolved air tank and micro-nano bubble generator, micro-nano bubbles are discharged to the bottom of the dissolved air tank through the micro-nano bubble generator. The scraper is driven by the scraper motor to scrape the scum on the surface of the wastewater in the dissolved air tank into the scum chamber. The scraper position is adjusted by sliding the mounting rod on the mounting block so that the lower end of the scraper is flush with the wastewater surface in the dissolved air tank, ensuring that the wastewater is fully scraped off.

[0021] 2. The locking rod and locking block can be used to position the scraper, preventing it from moving randomly and affecting the removal of scum.

[0022] 3. With the fixed plate and the push block, when the mounting block and the scraper move to the position of the push block, the push block can push the locking rod, so that the locking block is no longer embedded in the limit groove. At this time, the scraper can adjust its position. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide a further understanding of the application and to make other features, objects, and advantages of the application more apparent. The illustrative embodiments and descriptions of this application are used to explain the application and do not constitute an undue limitation of the application.

[0024] Furthermore, throughout the accompanying drawings, the same or similar reference numerals denote the same or similar elements. It should be understood that the drawings are schematic, and the elements are not necessarily drawn to scale.

[0025] In the attached diagram:

[0026] Figure 1 This is an overall schematic diagram according to one embodiment of the present application;

[0027] Figure 2 yes Figure 1 A cross-sectional view of the shell in the embodiment;

[0028] Figure 3 yes Figure 1 The embodiment is shown in the diagram of the float's installation.

[0029] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle;

[0030] Figure 5 yes Figure 1 The installation diagram of the sliding baffle in the embodiment is shown below;

[0031] Figure 6 yes Figure 5 A magnified view of a portion of point B in the middle;

[0032] Figure 7 yes Figure 1 A schematic diagram of the scraper installation in the embodiment;

[0033] Figure 8 yes Figure 7 A magnified view of a portion of point C in the middle;

[0034] Figure 9 yes Figure 8 A magnified view of a portion of point D.

[0035] Figure label:

[0036] 10. Shell; 11. Sedimentation tank; 12. Dissolved air tank; 13. Scum chamber; 14. Effluent tank; 15. Baffle; 16. Scraper motor; 17. Shaft; 18. Chain; 19. Scraper; 20. Float; 21. Sliding baffle; 22. Fixing plate; 23. Connecting block; 24. Semicircular block; 25. Mounting block; 26. Mounting rod; 27. Mounting spring; 28. Limiting plate; 29. ​​Locking rod; 30. Locking spring; 31. Locking block; 32. Limiting groove; 33. Sliding frame; 34. Sliding plate; 35. Limiting block; 36. First spring; 37. Second spring; 38. Compression spring; 39. Lightweight float head; 40. Pushing block; 41. Micro / nano bubble generator; 42. Sliding groove; 43. Insert strip. Detailed Implementation

[0037] Embodiments of this disclosure will now be described in more detail with reference to the accompanying drawings. While some embodiments of this disclosure are shown in the drawings, it should be understood that this disclosure can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this disclosure. It should be understood that the accompanying drawings and embodiments of this disclosure are for illustrative purposes only and are not intended to limit the scope of protection of this disclosure.

[0038] It should also be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. Unless otherwise specified, the embodiments and features described in this disclosure can be combined with each other.

[0039] It should be noted that the concepts of "first" and "second" mentioned in this disclosure are used only to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0040] It should be noted that the terms "a" and "a plurality of" used in this disclosure are illustrative rather than restrictive, and those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0041] This disclosure will now be described in detail with reference to the accompanying drawings and embodiments.

[0042] Reference Figure 1-9 A micro / nano bubble flotation dissolved air device includes: a shell 10, a sedimentation tank 11, a dissolved air tank 12, a scum chamber 13, an effluent tank 14, a partition plate 15, a micro / nano bubble generator 41, a scraper motor 16, a rotating shaft 17, a chain 18, and a scraper 19. The shell 10 contains the sedimentation tank 11, dissolved air tank 12, scum chamber 13, and effluent tank 14, arranged from right to left. Wastewater first enters the sedimentation tank 11, where flocculant is added to cause impurities in the wastewater to settle. The sedimentation tank 11 is connected to a drain pipe, which, through a drain pump, discharges the sediment from the sedimentation tank 11. The drain pump can be a WQ type submersible pump. The sedimentation tank 11 and the dissolved air tank 12 are separated by a partition plate. The height of the partition plate is less than the depth of the dissolved air tank 12, allowing wastewater from the upper layer of the sedimentation tank 11 to overflow into the dissolved air tank 12. A micro-nano bubble generator 41 is installed inside the housing 10. The micro-nano bubble generator 41 can be an NZ-NMX100 micro-nano bubble generator. The micro-nano bubble generator 41 discharges micro-nano bubbles to the bottom of the dissolved air tank 12 through a pipe, ensuring the bubbles fully contact the wastewater in the dissolved air tank 12. A scraper motor 16 is fixedly installed on the housing 10. Two rotating shafts 17 are also rotatably installed on the housing 10. The rotating shafts 17 are arranged horizontally above the dissolved air tank 12, with sprockets fixed at both ends. A chain 18 connects the sprockets of the two rotating shafts 17, and the two chains 18 are arranged front-to-back. The scraper motor 16 is connected to one of the rotating shafts 17 via a transmission chain, driving the rotating shaft 17 to rotate. A scraper 19 is installed on the chain 18, and the movement of the scraper 19 scrapes the scum in the dissolved air tank 12 into the scum chamber 13. The effluent tank 14 is connected to a pipe that extends into the dissolved air tank 12 and is located at the bottom of the dissolved air tank 12. A water pump pumps the wastewater in the dissolved air tank 12 into the effluent tank 14.

[0043] An mounting block 25 is fixedly installed on one link of the chain 18. An mounting rod 26 is provided on the mounting block 25, which passes through the mounting block 25 and slides with the mounting block 25. The lower end of the mounting rod 26 is fixedly connected to the scraper 19. Multiple limiting grooves 32 are provided on the mounting rod 26 along the axis of the mounting rod 26. A locking rod 29 is also provided on the mounting block 25, which passes through the mounting block 25 and slides with the mounting block 25. A locking block 31 is fixedly connected to one end of the locking rod 29, which is inserted into the mounting block 25 and embedded in the limiting groove 32. A retaining ring is provided at one end of the locking rod 29. A locking spring 30 is connected between the retaining ring and the mounting block 25. The two ends of the locking spring 30 are fixedly connected to the mounting block 25 and the retaining ring, respectively.

[0044] A fixing plate 22 is fixedly connected to the inner wall of the dissolved gas tank 12. A pushing block 40 is fixedly connected to the fixing plate 22. The pushing block 40 has an inclined surface. When the mounting block 25 moves with the chain 18, one end of the locking rod 29 abuts against the inclined surface, causing the locking rod 29 to move along the axis. When the mounting block 25 moves to the position of the fixing plate 22, one end of the locking rod 29 is pushed by the inclined surface, thereby causing the locking block 31 to no longer be embedded in the limiting groove 32. At this time, the mounting rod 26 can move along the axis under the action of gravity. Optionally, a retaining ring is also provided at one end of the mounting rod 26. A spring is connected between the retaining ring and the mounting block 25. The two ends of the spring are fixed to the mounting block 25 and the retaining ring, respectively. At the same time, when the lower end of the scraper 19 is closest to the bottom wall of the dissolved gas tank 12, the spring is not under force, and the scraper 19 can move towards the bottom wall of the dissolved gas tank 12 under the action of the spring.

[0045] A float 20 is installed inside the dissolved air tank 12. The float 20 is fixedly connected to a sliding baffle 21, and one side of the sliding baffle 21 is attached to the isolation plate 15. The float 20 floats on the surface of the wastewater in the dissolved air tank 12. When the height of the wastewater in the dissolved air tank 12 changes, the float 20 changes accordingly.

[0046] A connecting block 23 passing through a fixed plate 22 is fixedly connected to the float 20. A semi-circular block 24 is fixedly connected to the connecting block 23. A limiting plate 28 is fixedly connected to the scraper 19. The limiting plate 28 adjusts its position by contacting the curved surface of the semi-circular block 24. When the lower end of the scraper 19 is lower than the bottom wall of the float 20, the mounting block 25 moves to the position of the fixed plate 22, causing the limiting plate 28 to contact the semi-circular block 24. Under the action of the curved surface of the semi-circular block 24, the scraper 19 is pushed to move, making the bottom wall of the float 20 flush with the lower end of the scraper 19. The float 20 has a material density lower than that of water, and its main body can be made of rigid polyurethane foam.

[0047] A sliding groove 42 is provided on the connecting block 23. A sliding frame 33 is slidably connected in the sliding groove 42. A second spring 37 is connected between the sliding frame 33 and the end wall of the sliding groove 42. The two ends of the second spring 37 are fixedly connected to the end wall of the sliding groove 42 and the sliding frame 33, respectively. A sliding plate 34 is slidably connected in the sliding frame 33. Evenly distributed limiting blocks 35 are fixedly connected on the sliding plate 34. A first spring 36 is connected between the limiting block 35 and the sliding frame 33. The two ends of the first spring 36 are fixedly connected to the sliding frame 33 and the sliding plate 34, respectively. The limiting block 35 abuts against the fixed plate 22 for limiting. The limiting block 35 has an inclined surface, so that the limiting block 35 and the fixed plate 22 are unidirectionally limited. When the limiting block 35 extends out of the sliding groove 42, the fixed plate 22 is located on the movement path of the limiting block 35, and the connecting block 23 cannot move downward. The sliding frame 33 has two states: the first state is close to the fixed plate 22, and the second state is away from the fixed plate 22. When it is in the first state, the second spring 37 is in a stretched state, and the limiting block 35 protrudes from the connecting block 23 and can abut against the fixed plate 22. When it is in the second state, the second spring 37 is not under force, and the sliding plate 34 is in the sliding groove 42 and will not contact the fixed plate 22.

[0048] A lightweight float head 39 is provided on the lower side of the float block 20. A compression spring 38 connects the lightweight float head 39 and the float block 20. A strip 43 is fixedly connected to the lightweight float head 39, with one end inserted into the sliding groove 42. One end of the strip 43 is positioned on the inclined surface. When the strip 43 is inserted into the sliding groove 42, it pushes the sliding frame 33 to move, thereby causing the limiting block 35 to extend out of the sliding groove 42. The lightweight float head 39 can float on the water surface and can be made of foam material. When the wastewater level drops, the lightweight float head 39 will move with the water level under the action of the compression spring 38, causing the strip 43 to disengage from the sliding groove 42. Then, under the action of the second spring 37, the sliding frame 33 moves to the second state. At this time, the float block 20 can move downward. When the float block 20 moves to the water surface position, the lightweight float head 39, under the action of buoyancy, causes the strip 43 to re-insert into the sliding groove 42 of the sliding plate 3, and the sliding frame 33 returns to the first state. When the wastewater level rises, the limiting block 35 will not limit the fixed plate 22, and at this time both the lightweight float head 39 and the float 20 will rise.

[0049] Working process or usage method:

[0050] 1. During operation, wastewater is first introduced into sedimentation tank 11, and flocculant is added to sedimentation tank 11 to cause impurities in the wastewater to settle. Sedimentation tank 11 is connected to a sewage pipe, and the sewage pipe is connected to a sewage pump to discharge the sediment in sedimentation tank 11. The wastewater in the upper layer of sedimentation tank 11 flows into dissolved air tank 12 through the overflow baffle. Micro-nano bubble generator 41 discharges micro-nano bubbles to the bottom of dissolved air tank 12 through the pipe, so that the bubbles can fully contact the wastewater in dissolved air tank 12 for adsorption and impurity removal.

[0051] 2. By starting the scraper motor 16, the rotating shaft 17 is driven to rotate, which in turn drives the chain 18 to move, causing the scraper 19 to move and scrape the impurities on the surface of the wastewater in the dissolved air tank 12 into the scum chamber 13. When the water level in the dissolved air tank 12 drops, the float 20 will not move downward under the action of the limit block 35. At this time, the lightweight float head 39 will descend under the action of the compression spring 38. At this time, the insert 43 is pulled out of the sliding groove 42. At this time, under the action of the second spring 37, the sliding frame 33 will move to the second state. At this time, the float 20 will descend to the water surface. Under the action of the lightweight float head 39, the sliding frame 33 will return to the first state.

[0052] 3. When the mounting block 25 moves to the position of the fixed plate 22, the locking block 31 will be disengaged from the limiting groove 32 under the action of the pushing block 40. At this time, the mounting rod 26 drives the scraper 19 to move until the limiting plate 28 abuts against the pushing block 40. At this time, the lower end of the scraper 19 is flush with the lower end of the float 20, which can fully scrape off the scum.

[0053] 4. When the water level in the dissolved air tank 12 rises, the float 20 will move upward. When the mounting block 25 moves to the position of the fixed plate 22, the limiting plate 28 abuts against the curved surface of the semi-circular block 24. Under the action of the curved surface, the scraper 19 moves, making the lower end of the scraper 19 flush with the lower end of the float 20.

[0054] The above description is merely a selection of preferred embodiments of this disclosure and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in the embodiments of this disclosure is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the above-described inventive concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in the embodiments of this disclosure.

Claims

1. A micro-nano bubble air floatation dissolved gas device, characterized in that ,include: The shell (10) is provided with a sedimentation tank (11), a dissolved air tank (12), a scum chamber (13), and an effluent tank (14) arranged from right to left. The sedimentation tank (11) and the dissolved air tank (12) are separated by a partition. The dissolved air tank (12) and the scum chamber (13) are separated by a partition plate (15). The scum chamber (13) and the partition plate (15) are separated by a partition plate. The effluent tank (14) is connected to a pipe extending to the bottom of the dissolved air tank (12). A micro-nano bubble generator (41) is installed on the shell (10) to introduce micro-nano bubbles into the dissolved air pool (12); A scraping assembly is disposed on the housing (10), and the scraping assembly includes: The scraping motor (16) is fixed on the housing (10); Two rotating shafts (17) are rotatably mounted on the housing (10) and are connected to the power end of the scraping motor (16). A chain wheel is fixed on the rotating shaft (17). The chain (18) is mounted on the chain wheel on two rotating shafts (17). The rotation of the rotating shafts (17) drives the chain (18) to move. The scraper (19) is installed on the chain (18). The chain (18) drives the scraper (19) to move. The scraper (19) scrapes off the scum on the surface of the wastewater in the dissolved air tank (12) and scrapes the scum into the isolation plate (15). An adjustment component is provided on the scraper (19) to adjust the position of the scraper (19) according to the height of the water surface in the dissolved air tank (12).

2. The micro / nano bubble flotation dissolved air device according to claim 1, characterized in that: The adjustment component includes a mounting block (25), which is mounted on a chain (18) and moves with the chain (18). The mounting block (25) is provided with a mounting rod (26) that passes through the mounting block (25). The mounting rod (26) is slidably engaged with the mounting block (25). The lower end of the mounting rod (26) is fixedly connected to a scraper (19). The mounting rod (26) is provided with multiple limiting grooves (32) distributed along the axis of the mounting rod (26).

3. The micro / nano bubble flotation dissolved air device according to claim 2, characterized in that: The mounting block (25) is provided with a locking rod (29) that passes through the mounting block (25). One end of the locking rod (29) is fixedly connected to a locking block (31) that is inserted into the mounting block (25) and embedded in the limiting groove (32). One end of the locking rod (29) is provided with a retaining ring. A locking spring (30) is connected between the retaining ring and the mounting block (25). Both ends of the locking spring (30) are fixedly connected to the mounting block (25) and the retaining ring, respectively.

4. The micro / nano bubble flotation dissolved air device according to claim 3, characterized in that: A fixing plate (22) is fixedly connected to the inner wall of the dissolved gas tank (12), and a pushing block (40) is fixedly connected to the fixing plate (22). The pushing block (40) has an inclined surface. When the mounting block (25) moves with the chain (18), one end of the locking rod (29) abuts against the inclined surface, causing the locking rod (29) to move along the axis.

5. The micro / nano bubble dissolved air flotation device according to claim 4, characterized in that: A float (20) is provided in the dissolved air tank (12). A sliding baffle (21) is fixedly connected to the float (20). One side of the sliding baffle (21) is in contact with the isolation plate (15). A connecting block (23) passing through the fixed plate (22) is fixedly connected to the float (20). A semi-circular block (24) is fixedly connected to the connecting block (23). A limiting plate (28) is fixedly connected to the scraper (19). The limiting plate (28) adjusts its position by contacting the curved surface of the semi-circular block (24).

6. The micro / nano bubble flotation dissolved air device according to claim 5, characterized in that: The connecting block (23) has a sliding groove (42), and a sliding frame (33) is slidably connected in the sliding groove (42). A second spring (37) is connected between the sliding frame (33) and the end wall of the sliding groove (42). The two ends of the second spring (37) are fixedly connected to the end wall of the sliding groove (42) and the sliding frame (33) respectively. A sliding plate (34) is slidably connected in the sliding frame (33). A uniformly distributed limiting block (35) is fixedly connected on the sliding plate (34). The limiting block (35) and the sliding plate (34) are connected to the sliding plate (33). A first spring (36) is connected between the frames (33). The two ends of the first spring (36) are fixedly connected to the sliding frame (33) and the sliding plate (34) respectively. The limiting block (35) abuts against the fixed plate (22) for limiting. The limiting block (35) has an inclined surface, so that the limiting block (35) and the fixed plate (22) are unidirectionally limited. When the limiting block (35) extends out of the sliding groove (42), the fixed plate (22) is located on the movement path of the limiting block (35), and the connecting block (23) cannot move downward.

7. The micro / nano bubble flotation dissolved air device according to claim 6, characterized in that: A lightweight float head (39) is provided on the lower side of the float (20). A compression spring (38) is connected between the lightweight float head (39) and the float (20). The lightweight float head (39) is fixedly connected to a strip (43) with one end inserted into the sliding groove (42). One end of the strip (43) is set on the inclined surface. When the strip (43) is inserted into the sliding groove (42), the strip (43) pushes the sliding frame (33) to move, thereby causing the limiting block (35) to extend out of the sliding groove (42).

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