Chemical mixing device for wastewater treatment

Abstract

This application discloses a chemical mixing device for wastewater treatment, comprising a shell, a chemical delivery assembly, a spray pipe, and a pumping pipe. The bottom of the shell is connected to a wastewater pipe; the bottom surface of the shell is connected to a sludge pumping pipe; the spray pipe is disposed inside the shell, with multiple spray nozzles evenly distributed on it; the chemical delivery assembly is disposed at the top of the shell and is connected to the spray pipe; the pumping pipe is disposed on the shell, with its bottom end passing through and extending into the shell, and its top end located outside the shell; the portion of the pumping pipe inside the shell is retractable, and a floating airbag is provided at its bottom end; the bottom opening of the pumping pipe is located below the floating airbag, and the center of gravity of the floating airbag is located near the bottom opening of the pumping pipe. The chemical mixing device for wastewater treatment according to this application embodiment can automatically adjust the pumping position according to water level changes, avoiding the intake of excessive solid pollutants and clogging, and will not affect the continuity of pumping.

Description

Technical Field

[0001] This application relates to the technical field of wastewater treatment, and more particularly to a chemical mixing device for wastewater treatment. Background Technology

[0002] In the wastewater treatment industry, the water level in the treatment tank or reactor constantly changes as the treatment process proceeds, posing a dynamic adaptability requirement for pumping operations. Traditional wastewater treatment systems mostly use fixed-position pumping pipes, whose design often ignores the impact of water level fluctuations on pumping efficiency. When the water level drops, the fixed pumping pipe may fail to reach the water surface, leading to pumping failure; conversely, when the water level rises, it may become clogged due to the intake of excessive solid pollutants, affecting the continuity of pumping and the treatment effect.

[0003] Furthermore, due to the varying specific conditions of different wastewater treatment projects, including treatment scale, water quality characteristics, and water level fluctuation range, traditional fixed pumping pipe designs struggle to flexibly address these differences. This often leads to problems such as low pumping efficiency and high maintenance costs in practical applications. These issues are particularly prominent in situations requiring the treatment of large volumes of high-concentration wastewater or demanding efficient and continuous operation. Summary of the Invention

[0004] This application aims to at least partially address one of the technical problems in the related art.

[0005] Therefore, one objective of this application is to provide a chemical mixing device for wastewater treatment that can automatically adjust the pumping position according to changes in water level, avoid clogging due to excessive intake of solid pollutants, and not affect the continuity of pumping.

[0006] To achieve the above objectives, a first aspect of this application provides a chemical mixing device for wastewater treatment, comprising a housing, a chemical delivery assembly, a spray pipe, and a pumping pipe. The bottom of the housing is connected to a wastewater pipe; the bottom surface of the housing is connected to a sludge pumping pipe; the spray pipe is disposed inside the housing, with its bottom extending to the bottom of the housing and its top connected to the housing; the spray pipe has a plurality of spray nozzles evenly distributed on it; the chemical delivery assembly is disposed at the top of the housing and is connected to the spray pipe; the pumping pipe is disposed on the housing and is staggered from the spray pipe; the bottom end of the pumping pipe extends into the housing, and its top end is located outside the housing; the portion of the pumping pipe inside the housing is retractable, and a buoyancy airbag is provided at the bottom end of the pumping pipe; the bottom opening of the pumping pipe is located below the buoyancy airbag, and the center of gravity of the buoyancy airbag is located near the bottom opening of the pumping pipe.

[0007] The chemical mixing device for wastewater treatment in this application embodiment can automatically adjust the pumping position according to water level changes, avoiding the inhalation of too much solid pollutant and clogging, and will not affect the continuity of pumping.

[0008] In addition, the chemical mixing device for wastewater treatment proposed in this application may also have the following additional technical features:

[0009] In one embodiment of this application, the maximum length of the portion of the water pump pipe located inside the housing after elongation is not less than the length of the spray pipe.

[0010] In one embodiment of this application, the drug delivery assembly includes a drug tank, a pumping mechanism, and a drug delivery pipe, wherein the drug tank is mounted on the top surface of the housing; the pumping mechanism is mounted on the drug tank, the input end of the pumping mechanism is connected to the interior of the drug tank, and the output end of the pumping mechanism is connected to the drug delivery pipe; one end of the drug delivery pipe away from the drug tank passes through the housing and is connected to the spray pipe.

[0011] In one embodiment of this application, a separation component is further provided inside the housing; the separation component includes an outer positioning ring, an inner positioning ring, a connecting rod, and a separation gauze, wherein the inner positioning ring is slidably sleeved on the spray pipe, and the centers of the inner positioning ring and the outer positioning ring are located at the same point; the outer wall of the outer positioning ring is slidably connected to the inner wall of the housing; the two ends of the connecting rod are respectively connected to the outer positioning ring and the inner positioning ring; the separation gauze is annular in shape and is located below the connecting rod; the inner circle of the separation gauze is connected to the outer wall of the inner positioning ring, and the outer circle of the separation gauze is connected to the inner wall of the outer positioning ring.

[0012] In one embodiment of this application, the separation assembly further includes a plurality of adjusting airbags; the plurality of adjusting airbags are evenly disposed above the separating gauze, one end of the adjusting airbag is connected to the outer positioning ring, and the other end of the adjusting airbag is connected to the inner positioning ring; the bottom opening of the water pumping pipe abuts against the separating gauze, and the adjusting airbags are staggered from the water pumping pipe.

[0013] In one embodiment of this application, the separation component further includes a plurality of connecting air tubes; two adjacent regulating airbags are connected through the connecting air tubes.

[0014] In one embodiment of this application, a gas control assembly is provided inside the housing, the gas control assembly including an air pump and an air delivery pipe; the air pump is installed on the top of the housing, the input end of the air pump is connected to the inside of the housing, and the output end of the air pump is connected to the air delivery pipe; the air delivery pipe is a telescopic pipe, and the end of the air delivery pipe away from the air pump is connected to any one of the regulating airbags.

[0015] In one embodiment of this application, the maximum length of the extended gas pipe is not less than the length of the spray pipe.

[0016] In one embodiment of this application, a telescopic membrane is further provided inside the housing; the telescopic membrane has a cylindrical structure, and the spray pipe passes through the telescopic membrane; the bottom end of the telescopic membrane is sleeved on the inner positioning ring, and the top end of the telescopic membrane is connected to the inner top surface of the housing.

[0017] In one embodiment of this application, the inner wall of the inner positioning ring is provided with a plurality of water outlets.

[0018] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0019] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 This is a schematic diagram of a chemical mixing device for wastewater treatment according to an embodiment of this application;

[0021] Figure 2 This is a schematic diagram of the floating airbag in a chemical mixing device for wastewater treatment according to an embodiment of this application;

[0022] Figure 3 This is a top view schematic diagram of the separation component of a chemical mixing device for wastewater treatment according to an embodiment of this application;

[0023] Figure 4 This is a schematic diagram of the separation component structure of a chemical mixing device for wastewater treatment according to an embodiment of this application;

[0024] Figure 5 This is a schematic diagram of the separation component structure of a chemical mixing device for wastewater treatment according to another embodiment of this application;

[0025] Figure 6 This is a schematic diagram of the telescopic membrane structure of a chemical mixing device for wastewater treatment according to an embodiment of this application;

[0026] Figure 7 This is a schematic diagram showing the position of the telescopic membrane in a chemical mixing device for wastewater treatment according to an embodiment of this application.

[0027] As shown in the figure: 10. Shell; 11. Sewage pipe; 12. Sewage suction pipe; 13. Support leg; 20. Drug delivery assembly; 21. Drug tank; 22. Pumping mechanism; 23. Drug delivery pipe; 30. Spray pipe; 31. Spray nozzle; 40. Water suction pipe; 41. Floating airbag; 50. Separation assembly; 51. Outer positioning ring; 52. Inner positioning ring; 53. Connecting rod; 54. Separating gauze; 55. Adjusting airbag; 56. Connecting air pipe; 60. Air control assembly; 61. Air pump; 62. Air delivery pipe; 70. Telescopic membrane. Detailed Implementation

[0028] Embodiments of this application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application. Rather, embodiments of this application include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0029] The following describes a chemical mixing device for wastewater treatment according to an embodiment of this application, with reference to the accompanying drawings.

[0030] like Figures 1 to 7 As shown, the chemical mixing device for wastewater treatment in this application embodiment may include a housing 10, a chemical delivery assembly 20, a spray pipe 30, and a pumping pipe 40.

[0031] The bottom of the shell 10 is connected to a sewage pipe 11, through which sewage can be discharged into the shell 10.

[0032] The bottom surface of the shell 10 is connected to the sludge suction pipe 12, and the bottom of the shell 10 is provided with a support leg 13. The solid pollutants inside the shell 10 after treatment can be discharged through the sludge suction pipe 12.

[0033] The spray pipe 30 is disposed inside the housing 10, with the bottom of the spray pipe 30 extending to the bottom of the housing 10 and the top of the spray pipe 30 connected to the housing 10.

[0034] It should be noted that the spray pipe 30 can be vertically installed at the center of the housing 10.

[0035] Multiple spray nozzles 31 are evenly distributed on the spray pipe 30.

[0036] It should be noted that the number of spray nozzles 31 can be 25, 30, 35, 40, or 45, etc. The specific number can be selected according to actual needs, which will not be detailed here.

[0037] The drug delivery assembly 20 is located on the top of the housing 10 and is connected to the spray pipe 30.

[0038] It should be noted that the drug delivery component 20 is used to deliver the required drug solution into the spray pipe 30 for spraying.

[0039] The water pumping pipe 40 is installed on the housing 10, and the water pumping pipe 40 is staggered from the spray pipe 30.

[0040] The bottom end of the water pump 40 passes through and extends into the housing 10, while the top end of the water pump 40 is located outside the housing 10.

[0041] It should be noted that the top end of the water pump 40 can be connected to a water pump (not shown in the figure), and water can be pumped out of the housing 10 through the water pump 40.

[0042] The portion of the water pump 40 located inside the housing 10 is retractable, and a floating airbag 41 is provided at the bottom end of the water pump 40.

[0043] The maximum length of the portion of the pumping pipe 40 located inside the housing 10 after elongation is not less than the length of the spray pipe 30.

[0044] The bottom opening of the water pump 40 is located below the floating airbag 41, and the center of gravity of the floating airbag 41 is located on the side close to the bottom opening of the water pump 40.

[0045] It should be noted that the buoyancy airbag 41 is a hollow bladder structure, and the material of the buoyancy airbag 41 is rubber. The buoyancy airbag 41 can float on the water surface, and the bottom opening of the water pumping pipe 40 can be inserted into the water.

[0046] It should be noted that the distance between the bottom opening of the water pumping pipe 40 and the floating airbag 41 is selected according to actual needs, and will not be described in detail here.

[0047] To clearly illustrate the previous embodiment, in one embodiment of this application, as follows: Figure 1 As shown, the drug delivery assembly 20 includes a drug tank 21, a pumping mechanism 22, and a drug delivery pipe 23.

[0048] The medicine tank 21 is installed on the top surface of the housing 10 and is used to store medicine.

[0049] The pumping mechanism 22 is installed on the medicine tank 21. The input end of the pumping mechanism 22 is connected to the inside of the medicine tank 21, and the output end of the pumping mechanism 22 is connected to the medicine delivery pipe 23.

[0050] Among them, the pumping mechanism 22 can be a water pump.

[0051] The end of the delivery pipe 23 away from the liquid medicine tank 21 passes through the housing 10 and is connected to the spray pipe 30, so that the pumping mechanism 22 can deliver the liquid medicine in the liquid medicine tank 21 to the spray pipe 30 through the delivery pipe 23.

[0052] It should be noted that a transparent observation window (not shown in the figure) may be provided on the side wall of the housing 10. The observation window is a common structure in the prior art and will not be described in detail here.

[0053] Specifically, during actual operation, relevant personnel activate the pumping mechanism 22 to send the liquid medicine from the liquid medicine tank 21 into the spray pipe 30 through the delivery pipe 23; at the same time, sewage is discharged into the shell 10 through the sewage pipe 11; the sewage mixes with the liquid medicine sprayed from the spray pipe 30, and after standing for a period of time, the pollutants in the sewage are decomposed or precipitated under the action of the liquid medicine, and the liquid phase water in the upper layer is extracted through the pumping pipe 40 for subsequent treatment or discharge, and then the precipitated solid pollutants are discharged through the sewage extraction pipe 12.

[0054] The uniform spraying of the spray pipe 30 accelerates the mixing and reaction process of sewage and chemical solution; the extensibility of the pumping pipe 40 and the setting of the floating airbag 41 enable the pumping pipe 40 to work effectively at different water levels, improving the flexibility and efficiency of pumping, while preventing solid pollutants from being drawn away by the pumping pipe 40, thus improving the efficiency and stability of sewage treatment.

[0055] In one embodiment of this application, such as Figure 1 , Figure 3 and Figure 4 As shown, a separation component 50 is also provided inside the housing 10.

[0056] The separation assembly 50 includes an outer positioning ring 51, an inner positioning ring 52, a connecting rod 53, and a separation gauze 54.

[0057] The inner positioning ring 52 is slidably sleeved on the spray pipe 30, and the centers of the inner positioning ring 52 and the outer positioning ring 51 are located at the same point.

[0058] The outer wall of the outer positioning ring 51 is slidably connected to the inner wall of the housing 10.

[0059] The two ends of the connecting rod 53 are connected to the outer positioning ring 51 and the inner positioning ring 52 respectively, and the outer positioning ring 51 and the inner positioning ring 52 are connected together through the connecting rod 53.

[0060] It should be noted that the number of connecting rods 53 is at least one; for example, the number of connecting rods 53 can be two.

[0061] The separating gauze 54 is ring-shaped and located below the connecting rod 53.

[0062] The inner ring of the separating gauze 54 is connected to the outer wall of the inner positioning ring 52, and the outer ring of the separating gauze 54 is connected to the inner wall of the outer positioning ring 51.

[0063] It should be noted that the separating gauze 54 can separate the liquid phase water and solid phase pollutants in the wastewater after the medicine solution is mixed. The size of the small holes on the separating gauze 54 can be selected according to actual needs, which will not be described in detail here.

[0064] In one embodiment of this application, such as Figure 1 , Figure 3 and Figure 4 As shown, the separation assembly 50 also includes a plurality of adjustable airbags 55.

[0065] Multiple adjusting airbags 55 are evenly arranged above the separating gauze 54. One end of the adjusting airbag 55 is connected to the outer positioning ring 51, and the other end of the adjusting airbag 55 is connected to the inner positioning ring 52.

[0066] It should be noted that the number of adjustable airbags 55 can be 2, 3, 4, 5, or 6, and the specific number can be selected according to actual needs, which will not be detailed here.

[0067] It should be noted that the regulating airbag 55 is a hollow bladder structure and is made of rubber. The regulating airbag 55 can make the entire separation component 50 float on the water surface.

[0068] The bottom opening of the water pump 40 abuts against the separating gauze 54, and the adjusting airbag 55 is offset from the water pump 40.

[0069] Understandably, the separating gauze 54 is located below the regulating airbag 55. When the regulating airbag 55 floats on the water surface, the separating gauze 54 is below the water surface, and the water above the separating gauze 54 is the separated liquid phase water. At this time, the floating airbag 41 also floats on the water surface, allowing the bottom opening of the pumping pipe 40 to pump the liquid phase water. As the wastewater mixes with the chemical solution, the solid pollutants in the wastewater begin to precipitate. The liquid phase water in the wastewater enters above the separating gauze 54 through the small holes, mixing with the solid pollutants. Pollutant separation: The bottom opening of the pumping pipe 40 contacts the separating gauze 54. As the pumping pipe 40 is started, the liquid phase water is pumped out. As the pumping process proceeds, the water level gradually drops, and the separating component 50 also drops, keeping the separating gauze 54 always below the water level. Due to the synergistic effect of the pumping pipe 40 and the separating component 50, the liquid phase water and solid phase pollutants in the sewage are continuously separated. The pumping pipe 40 can continuously pump the liquid phase water until the liquid phase water in the sewage is completely pumped out.

[0070] By setting up the separation component 50, the effective separation of liquid water and solid pollutants in wastewater is achieved, improving the efficiency of subsequent treatment processes. The size of the holes in the separation gauze 54 and the number of regulating airbags 55 can be adjusted according to actual needs, enabling the equipment to adapt to wastewater treatment requirements of different properties and scales. Due to the solid-liquid separation, the load of solid pollutants in subsequent treatment processes is reduced, lowering treatment costs and energy consumption. As the separation component 50 continues to separate and descend, it can block suspended solid pollutants in the upper liquid water, making the liquid water drawn by the pumping pipe 40 cleaner and improving the wastewater treatment effect.

[0071] Furthermore, in one embodiment of this application, such as Figure 1 and Figure 5 As shown, the separation assembly 50 also includes a plurality of connecting air tubes 56, and the number of connecting air tubes 56 is one less than the number of regulating airbags 55.

[0072] Two adjacent regulating airbags 55 are connected by a connecting air tube 56, thereby enabling all regulating airbags 55 to be interconnected.

[0073] In one embodiment of this application, such as Figure 1 and Figure 5 As shown, a gas control assembly 60 is provided inside the housing 10. The gas control assembly 60 includes an air pump 61 and an air delivery pipe 62.

[0074] The air pump 61 is installed on the top of the housing 10. The input end of the air pump 61 is connected to the inside of the housing 10, and the output end of the air pump 61 is connected to the air supply pipe 62.

[0075] The gas supply pipe 62 is a telescopic pipe. The end of the gas supply pipe 62 away from the air pump 61 is connected to any one of the regulating air bags 55, so that the air pump 61 can control the amount of gas inside the regulating air bag 55, thereby controlling the size of the regulating air bag 55.

[0076] The maximum length of the gas supply pipe 62 after extension shall not be less than the length of the spray pipe 30.

[0077] It should be noted that by controlling the volume of the airbag 55, the buoyancy of the airbag 55 on the water surface or in the water can be controlled, thereby adjusting the overall floating and sinking state of the separation component 50.

[0078] It should be noted that a pressure sensor can be installed inside the regulating airbag 55 to reflect the amount of gas inside the regulating airbag 55 by detecting the air pressure value inside the regulating airbag 55.

[0079] Understandably, before the equipment is started, the regulating airbag 55 is in its initial inflated state, and the separation component 50 floats on the water surface. After the wastewater and the chemical solution are mixed, solid pollutants begin to settle, and the separation gauze 54 is located below the water surface to separate the liquid water and solid pollutants. The volume of the regulating airbag 55 can be controlled to make the separation component 50 sink, thereby separating the liquid water and solid pollutants once or multiple times. After separation, water is pumped out through the pumping pipe 40. At the same time, the volume and buoyancy of the regulating airbag 55 can be adjusted to control the distance between the separation gauze 54 and the pumping pipe 40, ensuring that the separation component 50 descends with the water level and maintains the optimal separation position of the separation gauze 54.

[0080] By precisely controlling the floating state of the separation component 50, the separation gauze 54 is always kept in the optimal separation position, thereby improving the separation efficiency of wastewater treatment. The telescopic air supply pipe 62 and the adjustable regulating airbag 55 enable the equipment to adapt to changes in water level and wastewater volume, improving the adaptability and flexibility of the equipment. By separating the settled wastewater once or multiple times before pumping, the purity of the liquid phase water is further guaranteed, thus improving the efficiency of wastewater treatment.

[0081] In one embodiment of this application, such as Figure 6 and Figure 7 As shown, a telescopic membrane 70 is also provided inside the housing 10.

[0082] The telescopic membrane 70 has a cylindrical structure, and the spray pipe 30 passes through the telescopic membrane 70.

[0083] The bottom end of the telescopic membrane 70 is fitted onto the inner positioning ring 52, and the top end of the telescopic membrane 70 is connected to the inner top surface of the housing 10.

[0084] The stretch membrane 70 is made of rubber.

[0085] It should be noted that the stretch membrane 70 is stretchable, and the elastic coefficient of the stretch membrane 70 is selected according to actual needs, which will not be detailed here.

[0086] Furthermore, in one embodiment of this application, such as Figure 6 and Figure 7 As shown, the inner wall of the inner positioning ring 52 may be provided with multiple drain outlets (not shown in the figure), and the medicine in the stretch membrane 70 can flow through the drain outlets into the sewage below the separating gauze 54.

[0087] It should be noted that multiple leaks can be 2, 3, 4, 5, or 6 leaks, etc. The specific number and size of the leaks are selected according to actual needs, which will not be detailed here.

[0088] Understandably, as the spray pipe 30 begins to spray the medicine, the medicine sprayed from the spray nozzle 31 above the water surface first enters the stretch membrane 70. Due to the blocking effect of the stretch membrane 70, this part of the medicine gathers together and flows through the drain into the sewage below the separating gauze 54, so that this part of the medicine can come into contact with and mix with the sewage more quickly and will not be blocked by the separating gauze 54.

[0089] The barrier and guiding function of the telescopic membrane 70 allows the chemical solution to mix with the sewage more quickly, improving mixing efficiency and thus accelerating the sedimentation rate of solid pollutants. By controlling the number and size of the leaks, the chemical solution is ensured to contact the sewage in the best way, improving the treatment effect. The telescopic membrane 70 reduces waste caused by the chemical solution being sprayed directly onto the separating gauze 54. The material, elastic coefficient, and number and size of the leaks of the telescopic membrane 70 can all be adjusted according to actual needs, enabling the equipment to adapt to the treatment needs of different types, concentrations, and heights of sewage, thus improving the adaptability and flexibility of the equipment.

[0090] In summary, the chemical mixing device for wastewater treatment in this application embodiment can automatically adjust the pumping position according to water level changes, avoiding the inhalation of too much solid pollutant and clogging, and will not affect the continuity of pumping.

[0091] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0093] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A chemical mixing device for sewage treatment, characterized by, The shell, the medicine feeding assembly, the spray pipe and the water suction pipe are included, wherein, The bottom of the shell is communicated with the sewage pipe; The bottom surface of the shell is communicated with the sewage suction pipe; The spray pipe is arranged inside the shell, the bottom of the spray pipe extends to the bottom of the shell, and the top of the spray pipe is connected with the shell; Multiple spray openings are uniformly arranged on the spray pipe; The medicine feeding assembly is arranged on the top of the shell, and the medicine feeding assembly is communicated with the spray pipe; The water suction pipe is arranged on the shell, and the water suction pipe is staggered with the spray pipe; The bottom end of the water suction pipe extends into the shell, and the top end of the water suction pipe is located outside the shell; The part of the water suction pipe in the shell is telescopic, and the bottom end of the water suction pipe is provided with a floating air bag; The bottom opening of the water suction pipe is located below the floating air bag, and the center of gravity of the floating air bag is located on the side close to the bottom opening of the water suction pipe; The shell is further provided with a separation assembly; The separation assembly includes an outer positioning ring, an inner positioning ring, a connecting rod and a separation gauze, wherein, The inner positioning ring is slidably sleeved on the spray pipe, and the centers of the outer positioning ring and the inner positioning ring are located at the same point; The outer wall of the outer positioning ring is slidably connected with the inner wall of the shell; The connecting rod is connected with the outer positioning ring and the inner positioning ring at two ends respectively; The separation gauze is annular, and the separation gauze is located below the connecting rod; The inner circle of the separation gauze is connected with the outer wall of the inner positioning ring, and the outer circle of the separation gauze is connected with the inner wall of the outer positioning ring; The separation assembly further includes multiple adjusting air bags; Multiple adjusting air bags are uniformly arranged above the separation gauze, one end of the adjusting air bag is connected with the outer positioning ring, and the other end of the adjusting air bag is connected with the inner positioning ring; The bottom opening of the water suction pipe abuts against the separation gauze, and the adjusting air bag is staggered with the water suction pipe; The shell is provided with a gas control assembly, and the gas control assembly includes a gas pump and a gas conveying pipe; The gas pump is installed on the top of the shell, the input end of the gas pump is communicated with the inside of the shell, and the output end of the gas pump is connected with the gas conveying pipe; The gas conveying pipe is a telescopic pipe, and one end of the gas conveying pipe away from the gas pump is connected with any one of the adjusting air bags; The shell is further provided with a telescopic membrane; The telescopic membrane is a circular tube structure, and the spray pipe passes through the telescopic membrane; The bottom end of the telescopic membrane is sleeved on the inner positioning ring, and the top end of the telescopic membrane is connected with the inner top surface of the shell; Multiple water leakage openings are arranged on the inner wall of the inner positioning ring.

2. The chemical mixing device for sewage treatment according to claim 1, characterized in that, The maximum length value of the part of the water suction pipe in the shell after elongation is not less than the length value of the spray pipe.

3. The chemical mixing device for sewage treatment according to claim 1, characterized in that, The medicine feeding assembly includes a liquid medicine tank, a pumping mechanism and a medicine feeding pipe, wherein, The liquid medicine tank is installed on the top surface of the shell; The pumping mechanism is installed on the liquid medicine tank, the input end of the pumping mechanism is communicated with the inside of the liquid medicine tank, and the output end of the pumping mechanism is connected with the medicine feeding pipe; One end of the medicine feeding pipe away from the liquid medicine tank passes through the shell and is connected with the spray pipe.

4. The chemical mixing device for sewage treatment according to claim 1, characterized in that, The separation assembly further comprises a plurality of connecting air pipes; Two adjacent adjusting air bags are communicated through the connecting air pipes.

5. The chemical mixing device for sewage treatment according to claim 1, wherein The maximum length of the air supply pipe after elongation is not less than the length of the spray pipe.

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