A dosing device and a dosing method for sewage treatment

Abstract

The present application relates to sewage treatment technical field, specifically disclose a kind of dosing device and dosing method for sewage treatment, comprising: cylinder and storage tank, the inside of cylinder is fixedly installed with two partition plates, the inside of cylinder is divided into water storage cavity, dosing cavity and drainage cavity from top to bottom, and storage tank is arranged in the inside of dosing cavity;The outside of storage tank is fixedly installed with buffer tank, buffer tank is provided with sealing disc in the inside, and sealing disc can be lifted in buffer tank, and buffer tank is communicated with water storage cavity by communicating pipe;The dosing device and dosing method for sewage treatment of the present application, the sewage in the present application is batched by buffer tank, the sewage in water storage cavity is zeroed, after batched dosing, it is gathered and discharged by drainage cavity again, and the pressurization of buffer tank to sewage is cooperated with venturi tube to form negative pressure environment, the medicine sent to suction pipe port is directly inhaled into sewage to be dosed and mixed, so that the fine particle size of medicine powder is evenly dispersed in wastewater.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewage treatment technical field, specifically to a dosing device for sewage treatment and a dosing method. BACKGROUND

[0002] Sewage treatment is a process of removing pollutants in sewage by physical, chemical and biological methods to meet discharge standards or reuse requirements. In sewage treatment, it is often necessary to add specific chemical agents to the sewage to remove pollutants in the water through physical adsorption, chemical reaction (such as neutralization, oxidation-reduction, precipitation) or biological synergistic effect.

[0003] The existing sewage treatment often directly throws and pours the medicine powder from above the sewage tank when adding medicine powder, and mixes the medicine powder with the sewage through stirring. This process not only easily forms a stirring dead angle, especially for high-viscosity wastewater, but also easily causes the thrown medicine powder to be easily blocked by the generated precipitate or flocculent suspended matter when the medicine powder gradually diffuses from top to bottom into the entire sewage tank, which easily causes the local medicine concentration in the sewage tank to be too high or too low, resulting in poor use effect of the medicine powder, and the need to pour excessive medicine powder to ensure good treatment effect of the sewage, which is high in cost. SUMMARY

[0004] The present application provides a dosing device for sewage treatment and a dosing method, which aims to solve the problem that the thrown medicine powder easily forms a stirring dead angle, especially for high-viscosity wastewater, and easily causes the thrown medicine powder to be easily blocked by the generated precipitate or flocculent suspended matter when the medicine powder gradually diffuses from top to bottom into the entire sewage tank, which easily causes the local medicine concentration in the sewage tank to be too high or too low.

[0005] The dosing device for sewage treatment of the present application comprises a cylinder and a storage tank, two partition plates are fixedly installed inside the cylinder, which divides the inside of the cylinder from top to bottom into a water storage cavity, a dosing cavity and a drainage cavity, and the storage tank is arranged inside the dosing cavity.

[0006] A buffer tank is fixedly installed on the outside of the storage tank, a sealing disc is arranged inside the buffer tank, and the sealing disc can be lifted and lowered in the buffer tank. The buffer tank and the water storage cavity are connected through a communication pipe. When the sealing disc is lifted, the sewage in the water storage cavity can be pumped into the buffer tank through the communication pipe.

[0007] A Venturi tube is arranged between the buffer tank and the drainage cavity, which can press the sewage into the Venturi tube when the sealing disc is lowered. A suction pipe is arranged between the Venturi tube and the storage tank. A screw conveyor shaft and a material turning frame are arranged inside the suction pipe. The material turning frame is fixed to one end of the screw conveyor shaft close to the Venturi tube. The screw conveyor shaft can rotate in the suction pipe to convey the medicine powder to the suction pipe opening and turn it, so that the medicine powder is mixed into the sewage under the negative pressure adsorption of the Venturi tube.

[0008] Preferably, the top of the storage tank is coaxially rotatably provided with a cover, and the cover is rotatably provided on the partition plate, and the bottom of the storage tank is fixedly provided with an inner cylinder.

[0009] Preferably, the inside of the buffer tank is fixedly provided with a base, the inside of the base is rotatably provided with a reciprocating screw rod, the top end of the reciprocating screw rod extends to the outside of the buffer tank and is rotatably provided on the partition plate, the outside of the reciprocating screw rod is provided with a sliding block capable of sliding up and down when the reciprocating screw rod rotates, the sliding block is fixedly connected with the sealing disc, the top end of the reciprocating screw rod is fixedly provided with a transmission gear, the outside of the cover is coaxially fixedly provided with a gear ring, and the gear ring is engaged with the transmission gear.

[0010] Preferably, the communication pipe is located on the outside of the buffer tank, the top end of the communication pipe is communicated with the water storage cavity, and the bottom end of the communication pipe is provided with a first one-way valve between the buffer tank, and the first one-way valve is located below the sealing disc and can be opened when the sealing disc rises and closed when the sealing disc descends.

[0011] Preferably, the inside of the Venturi tube is provided with a tapered air chamber and a mixing diffusion chamber communicated with the air chamber, the mixing diffusion chamber is communicated with the drainage cavity, the air chamber is communicated with the air suction pipe, the inside of the air chamber is fixedly provided with a water inlet pipe, the water outlet end of the water inlet pipe is provided with a spray head, and the water inlet end of the water inlet pipe is provided with a second one-way valve between the buffer tank, which can be opened when the sealing disc descends and closed when the sealing disc rises.

[0012] Preferably, the end of the air suction pipe away from the Venturi tube extends through the storage tank into the inner cylinder, the side wall of the air suction pipe is provided with a notch in the storage tank, the auger conveying shaft is fixedly provided with a driven bevel gear in the inner cylinder, and one side of the driven bevel gear is engaged with a driving bevel gear rotatably provided on the top of the inner cylinder.

[0013] Preferably, the bottom of the cover is coaxially fixedly provided with a rotating shaft in the storage tank, the bottom end of the rotating shaft is fixedly connected with the driving bevel gear, the outside of the rotating shaft is slidably provided with a sliding sleeve, and the side wall of the sliding sleeve is fixedly provided with a stirring blade.

[0014] Preferably, the stirring blade is fixedly connected with a connecting rod, the inner wall of the storage tank is coaxially fixedly provided with a guide ring, the inside of the guide ring is provided with a wave-shaped undulating groove, and the end of the connecting rod away from the stirring blade is slidably provided in the undulating groove.

[0015] Preferably, the end of the air suction pipe is provided with a stop block, the stop block and the air suction pipe are provided with a spring, and the stop block can be separated from the pipe opening of the air suction pipe under the negative pressure adsorption of the air chamber of the Venturi tube.

[0016] A dosing method for sewage treatment comprises the following steps:

[0017] Step one: injecting sewage into the water storage cavity and filling the storage tank with drug powder;

[0018] Step 2: Drive the cap to rotate, which in turn drives the reciprocating screw to rotate, and at the same time causes the rotating shaft to drive the stirring blades and the auger conveyor shaft to rotate;

[0019] Step 3: The reciprocating screw drives the sealing disc to rise, creating negative pressure in the buffer tank, which opens the first one-way valve and draws the sewage in the water storage chamber into the buffer tank through the connecting pipe.

[0020] Step 4: The reciprocating screw drives the sealing disc to descend and pressurize the sewage, causing the second one-way valve to open, and the sewage is forced into the venturi tube through the inlet pipe and the nozzle.

[0021] Step 5: A negative pressure is formed in the conical air chamber of the venturi tube, the adsorption block moves away from the inlet of the suction tube, and the powder is drawn into the air chamber from the inlet of the suction tube.

[0022] Step Six: The powder and wastewater enter the mixing and diffusion chamber together to complete the mixing, and then are collected in the drainage chamber.

[0023] Beneficial effects:

[0024] In use, this invention employs a buffer tank to buffer wastewater in batches, breaking down the wastewater in the storage chamber into smaller portions. After each batch of medication is added, the wastewater is collected and discharged through the drainage chamber. This effectively improves the uniformity of the mixing between the medication powder and the wastewater, increasing mixing efficiency. Furthermore, the pressurization of the wastewater by the buffer tank, combined with the venturi tube, creates a negative pressure environment. The medication delivered to the suction pipe port is directly drawn into the wastewater for mixing. The fluid vortex generated by the negative pressure actively tears apart agglomerated particles, allowing the medication powder to be evenly dispersed in the wastewater with a finer particle size. This achieves highly efficient dispersion and mixing of the medication powder and wastewater, effectively preventing medication powder from clumping in the wastewater. Adding medication while the wastewater is flowing also effectively prevents the formation of precipitates or flocs that could obstruct the diffusion of the medication powder, avoiding situations where the local drug concentration in the wastewater is too high or too low, thus improving the dosing effect. Attached Figure Description

[0025] Figure 1 This is a perspective view of the present invention.

[0026] Figure 2 This is a cross-sectional view of the present invention.

[0027] Figure 3 This is the present invention. Figure 2 A magnified structural diagram of point A in the middle.

[0028] Figure 4 This is the present invention. Figure 2 A magnified structural diagram at point B in the middle.

[0029] Figure 5 This is a schematic diagram of the internal structure of the drug delivery chamber of the present invention.

[0030] Figure 6 is a perspective view of the sealing disc of the present application.

[0031] Reference signs:

[0032] 10, barrel; 11, partition plate; 12, water storage cavity; 13, medicine adding cavity; 14, drainage cavity; 20, storage tank; 21, cover; 211, gear ring; 22, feeding pipe; 23, inner barrel; 24, guide ring; 25, undulating groove; 30, buffer tank; 31, sealing disc; 32, limiting groove; 33, limiting block; 34, communication pipe; 35, first one-way valve; 40, lifting assembly; 41, base; 42, reciprocating lead screw; 421, transmission gear; 43, sliding block; 50, medicine adding assembly; 51, Venturi tube; 52, water inlet pipe; 53, nozzle; 54, second one-way valve; 55, air suction pipe; 60, feeding assembly; 61, auger conveying shaft; 611, driven bevel gear; 612, driving bevel gear; 62, material turning frame; 70, mixing assembly; 71, rotating shaft; 72, sliding sleeve; 73, stirring blade; 731, connecting rod; 80, sealing assembly; 81, stop block; 82, spring. DETAILED DESCRIPTION

[0033] Embodiments of the present application are described in detail below with reference to the accompanying drawings. The embodiments described below are exemplary and are intended to explain the present application, and should not be understood as limiting the present application.

[0034] As Figures 1 to 6 shown, the medicine adding device for sewage treatment of the present application comprises a barrel 10, a storage tank 20, a buffer tank 30, a lifting assembly 40, a medicine adding assembly 50, a feeding assembly 60, a mixing assembly 70, and a sealing assembly 80. The storage tank 20 is arranged in the barrel 10 and is used for storing medicine powder. The storage tank 20 can mix the various medicine powders stored therein under the action of the mixing assembly 70, and then the medicine powder is sent out by the feeding assembly 60. The buffer tank 30 and the medicine adding assembly 50 are located outside the storage tank 20. The buffer tank 30 can store sewage in batches under the action of the lifting assembly 40, and can send the stored sewage into the medicine adding assembly 50 after pressurizing, so that the medicine powder sent out by the feeding assembly 60 is adsorbed into the medicine adding assembly 50 to be mixed with the sewage quickly to complete the medicine adding.

[0035] Referring to Figure 1 and Figure 2 , the inside of the barrel 10 is fixedly provided with two upper and lower partition plates 11. The two partition plates 11 divide the inside space of the barrel 10 into a water storage cavity 12, a medicine adding cavity 13, and a drainage cavity 14 from top to bottom. The barrel 10 is provided with a water inlet pipe and a drainage pipe, which are in communication with the water storage cavity 12 and the drainage cavity 14, respectively.

[0036] Referring to Figure 1 , Figure 2 and Figure 3 , the storage tank 20 is arranged inside the medicating cavity 13 and coaxially arranged with the barrel 10, the top of the storage tank 20 is coaxially rotationally assembled with a cover 21, the cover 21 is rotationally assembled on the partition plate 11, the top of the barrel 10 is fixedly installed with a motor, and the output shaft of the motor is fixed with the cover 21, so as to drive the cover 21 to rotate in the medicating cavity 13, the sidewall of the storage tank 20 is inserted with a plurality of feeding pipes 22, the feeding pipes 22 all extend to the top of the barrel 10 through the water storage cavity 12, so as to facilitate the replenishment of the medicating powder in the storage tank 20, and the bottom of the storage tank 20 is fixedly installed with an inner barrel 23 with an open lower end.

[0037] Referring to Figure 2 , Figure 5 and Figure 6 , the buffer tank 30 is fixedly installed in the medicating cavity 13 and is annularly and uniformly distributed along the circumferential direction of the storage tank 20, and is fixed with the storage tank 20, the inside of the buffer tank 30 is provided with a sealing disc 31, the sealing disc 31 can be lifted and lowered in the buffer tank 30, and can draw negative pressure in the buffer tank 30 when lifted, and can increase the pressure of the sewage in the buffer tank 30 when lowered, the inner wall of the buffer tank 30 is provided with a limiting groove 32, the sidewall of the sealing disc 31 is fixedly installed with a limiting block 33, the limiting block 33 is slidingly assembled in the inside of the limiting groove 32, so as to limit the sealing disc 31, so that the sealing disc 31 can only slide up and down in the buffer tank 30, but cannot rotate.

[0038] The outside of the buffer tank 30 is provided with a communication pipe 34, the top end of the communication pipe 34 is communicated with the water storage cavity 12, the bottom end of the communication pipe 34 and the buffer tank 30 are provided with a first one-way valve 35, the first one-way valve 35 is located below the sealing disc 31, can be opened when the sealing disc 31 is lifted to draw negative pressure in the buffer tank 30, so that the sewage in the water storage cavity 12 is drawn into the inside of the buffer tank 30 through the communication pipe 34, and can be closed when the sealing disc 31 is lowered to increase the pressure of the sewage in the buffer tank 30, so that the sewage cannot return to the water storage cavity 12 through the communication pipe 34.

[0039] Referring to Figure 2 and Figure 5 , the lifting assembly 40 includes a base 41, a reciprocating screw rod 42 and a sliding block 43, the base 41 is fixedly installed in one end of the buffer tank 30 close to the first one-way valve 35, the reciprocating screw rod 42 is coaxially arranged in the buffer tank 30, the bottom end is rotationally assembled on the base 41, and the top end extends to the outside of the buffer tank 30 and is rotationally assembled on the partition plate 11, the sliding block 43 is arranged outside the reciprocating screw rod 42 and is fixed with the sealing disc 31, can reciprocate up and down when the reciprocating screw rod 42 rotates, and in turn drives the sealing disc 31 to move up and down in the buffer tank 30.

[0040] The top end of the reciprocating screw 42 is fixedly provided with a transmission gear 421, and the outer side of the cover 21 is coaxially provided with a gear ring 211 which is engaged with the transmission gear 421. When the cover 21 rotates, the gear ring 211 pushes the transmission gear 421 to rotate, so that the reciprocating screw 42 rotates in the buffer tank 30.

[0041] Reference Figure 2 With Figure 5 The dosing assembly 50 comprises a Venturi tube 51, a water inlet pipe 52, a spray head 53, a second one-way valve 54 and an air suction pipe 55. The Venturi tube 51 is arranged between the buffer tank 30 and the drainage cavity 14, and is internally provided with a tapered air chamber and a mixing diffusion chamber which is in communication with the air chamber. The mixing diffusion chamber of the Venturi tube 51 is in communication with the drainage cavity 14. The water inlet pipe 52 is fixedly assembled in the air chamber of the Venturi tube 51. The spray head 53 is arranged at the water outlet end of the water inlet pipe 52. The second one-way valve 54 is arranged between the water inlet pipe 52 and the buffer tank 30. The second one-way valve 54 can be opened when the sealing disc 31 descends to pressurize the sewage in the buffer tank 30, so that the high-pressure sewage can enter the air chamber of the Venturi tube 51 through the water inlet pipe 52. The second one-way valve 54 can also be closed when the sealing disc 31 rises, so as to perform negative pressure extraction in the buffer tank 30 and supplement the sewage. The air suction pipe 55 is inserted into the side wall of the Venturi tube 51 and is in communication with the air chamber. The end of the air suction pipe 55 away from the Venturi tube 51 extends into the inner cylinder 23 through the storage tank 20. The side wall of the air suction pipe 55 is provided with a gap in the storage tank 20, so that the medicine powder can enter the air suction pipe 55 through the gap. When the high-pressure sewage enters the mixing diffusion chamber from the air chamber of the Venturi tube 51, a negative pressure is formed in the air chamber, and the medicine powder in the air suction pipe 55 is sucked into the air chamber together with the sewage to add the medicine powder. Through the double effects of airflow entrainment and fluid turbulence in the negative pressure, the medicine powder and the sewage are efficiently dispersed, the agglomeration of the medicine powder is effectively avoided, and the reaction time is shortened.

[0042] Reference Figure 3 The feeding assembly 60 comprises an auger conveying shaft 61 and a material turning frame 62. The auger conveying shaft 61 is rotatably assembled in the air suction pipe 55. The material turning frame 62 is fixedly installed at one end of the auger conveying shaft 61 close to the Venturi tube 51, and the side wall of the material turning frame 62 is closely arranged against the inner wall of the air suction pipe 55. The auger conveying shaft 61 can rotate in the air suction pipe 55 to push the medicine powder towards the medicine outlet end of the air suction pipe 55, i.e. one end close to the Venturi tube 51, and the material turning frame 62 can turn the medicine powder accumulated at the medicine outlet end of the air suction pipe 55, so as to avoid the accumulation and blockage of the medicine powder in the air suction pipe 55 and facilitate the medicine powder to be sucked into the Venturi tube 51 under the action of negative pressure.

[0043] The driven bevel gear 611 is fixedly installed on the auger conveying shaft 61 in the inner cylinder 23. One side of the driven bevel gear 611 is engaged with the driving bevel gear 612 which is rotatably arranged at the top of the inner cylinder 23. The driving bevel gear 612 can synchronously rotate with the rotation of the cover 21, drives the driven bevel gear 611 to rotate, and then drives the auger conveying shaft 61 to rotate.

[0044] With reference to Figure 2 With Figure 4 The mixing assembly 70 comprises a rotating shaft 71, a sliding sleeve 72 and stirring blades 73. The rotating shaft 71 is coaxially fixed to the bottom of the cover 21 and located in the storage tank 20. The bottom end of the rotating shaft 71 is fixed to the driving bevel gear 612. The sliding sleeve 72 is slidably arranged on the outside of the rotating shaft 71. The stirring blades 73 are fixedly installed on the side wall of the sliding sleeve 72 and can rotate with the cover 21, the sliding sleeve 72 and the stirring blades 73, thereby stirring the medicine powder in the storage tank 20, preventing the medicine powder from accumulating in the storage tank 20 and facilitating the mixing of various medicine powders.

[0045] The stirring blades 73 are fixedly connected with a connecting rod 731. A guide ring 24 is coaxially fixed to the inner wall of the storage tank 20. A wave-shaped undulating groove 25 is formed in the inside of the guide ring 24. The end of the connecting rod 731 away from the stirring blades 73 is slidably arranged in the undulating groove 25. When the stirring blades 73 rotate, the connecting rod 731 is guided by the undulating groove 25 to make the sliding sleeve 72 and the stirring blades 73 undulate up and down, thereby improving the stirring effect of the medicine powder.

[0046] With reference to Figure 3 The sealing assembly 80 comprises a stopper 81 and a spring 82. The stopper 81 is arranged at the end of the air suction pipe 55. The spring 82 is arranged between the stopper 81 and the air suction pipe 55. The stopper 81 can be separated from the pipe opening of the air suction pipe 55 under the negative pressure adsorption of the air chamber of the venturi tube 51, overcome the action force of the spring 82, open the pipe opening of the air suction pipe 55, and then suck the medicine powder into the venturi tube 51. When the negative pressure in the air chamber of the venturi tube 51 disappears, the spring 82 drives the stopper 81 to reset and close the pipe opening of the air suction pipe 55, preventing water vapor from entering and causing the medicine powder to be damp and clog the air suction pipe 55, and ensuring that the equipment maintains good dosing effect.

[0047] A dosing method for sewage treatment comprises the following steps:

[0048] Step one: inject sewage into the water storage cavity 12, and fill the medicine powder into the storage tank 20 through the feeding pipe 22;

[0049] Step two: drive the cover 21 to rotate by the motor, drive the reciprocating screw rod 42 to rotate, drive the rotating shaft 71 to rotate with the stirring blades 73 and the auger conveying shaft 61, move the medicine powder in the air suction pipe 55 to the venturi tube 51, and stir the medicine powder by the material stirring frame 62.

[0050] Step three: reciprocating screw 42 rotation in the push block 43 drive sealing disc 31 lifting, the buffer tank 30 in the negative pressure, the first check valve 35 open, the second check valve 54 close, through the communication pipe 34 will sewage in the storage water cavity 12 into the buffer tank 30 in;

[0051] Step four: reciprocating screw 42 continues to rotate, the slider 43 rises to a certain height and then begins to decline, drive sealing disc 31 decline to the sewage in the buffer tank 30 pressurization, the second check valve 54 open, the first check valve 35 close, the sewage by water inlet pipe 52 and shower head 53 into the venturi tube 51 in;

[0052] Step five: sewage through the rapid flow of the venturi tube 51 in the conical cavity to form a negative pressure, adsorption block 81 away from the air suction pipe 55, so that its pipe opening open, by the negative pressure will be powder from the air suction pipe 55 port into the air cavity;

[0053] Step six: powder and sewage into the mixing diffusion chamber complete mixing, and then by the drainage cavity 14 to gather.

[0054] The application is batched by the buffer tank 30 to the sewage, the sewage in the storage water cavity 12 is divided into zero, and the sewage is gathered and discharged by the drainage cavity 14 after being dosed in batches, which can effectively improve the uniformity of the mixing of the powder and the sewage, improve the mixing efficiency, and the pressurization of the sewage by the buffer tank 30 and the venturi tube 51 cooperate to form a negative pressure environment, the medicine sent to the air suction pipe 55 port is directly sucked into the sewage for dosing and mixing, the fluid vortex caused by the negative pressure actively tears the agglomerated particles, so that the powder is uniformly dispersed in the wastewater with a finer particle size, realizes the efficient dispersion and mixing of the powder and the wastewater, effectively avoids the caking of the powder in the sewage, and the dosing in the sewage flow can effectively avoid the blockage of the diffusion of the powder by the precipitate or flocculent generated by the reaction, avoids the situation that the local drug concentration in the sewage is too high or too low, and improves the dosing effect of the sewage.

[0055] Although the embodiments of the application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the application.

Claims

1. A dosing device for sewage treatment, comprising a cylinder (10) and a storage tank (20), characterized in that, The inside of the barrel (10) is fixedly provided with two partition plates (11), which divide the inside of the barrel (10) into a water storage cavity (12), a medicine adding cavity (13) and a water drainage cavity (14) from top to bottom, and the storage tank (20) is arranged in the medicine adding cavity (13); The outside of the storage tank (20) is fixedly provided with buffer tanks (30), the buffer tanks (30) are multiple, are fixedly arranged in the medicine adding cavity (13), are annularly and uniformly distributed along the circumferential direction of the storage tank (20), are fixed with the storage tank (20), the inside of the buffer tank (30) is provided with a sealing disc (31), the sealing disc (31) can be lifted in the buffer tank (30), the buffer tank (30) and the water storage cavity (12) are connected through a communication pipe (34), when the sealing disc (31) is lifted, sewage in the water storage cavity (12) can be pumped into the buffer tank (30) through the communication pipe (34); The buffer tank (30) and the water drainage cavity (14) are provided with a Venturi tube (51), when the sealing disc (31) is lowered, sewage can be pressed into the Venturi tube (51), the Venturi tube (51) and the storage tank (20) are provided with an air suction pipe (55), the inside of the air suction pipe (55) is provided with an auger conveying shaft (61) and a material turning frame (62), the material turning frame (62) is fixed to one end of the auger conveying shaft (61) close to the Venturi tube (51), the auger conveying shaft (61) can rotate in the air suction pipe (55), powder is conveyed to the air suction pipe (55) and turned over, so that the powder is mixed into sewage under the negative pressure adsorption of the Venturi tube (51); The communication pipe (34) is located outside the buffer tank (30), the top end of the communication pipe (34) is connected with the water storage cavity (12), the bottom end of the communication pipe (34) and the buffer tank (30) are provided with a first one-way valve (35), and the first one-way valve (35) is located below the sealing disc (31), which can be opened when the sealing disc (31) is lifted and closed when the sealing disc (31) is lowered; The inside of the Venturi tube (51) is provided with a conical air chamber and a mixing diffusion chamber connected therewith, the mixing diffusion chamber is connected with the water drainage cavity (14), the air chamber is connected with the air suction pipe (55), the air chamber is fixedly provided with a water inlet pipe (52), the water outlet end of the water inlet pipe (52) is provided with a spray head (53), the water inlet end of the water inlet pipe (52) and the buffer tank (30) are provided with a second one-way valve (54), which can be opened when the sealing disc (31) is lowered and closed when the sealing disc (31) is lifted; The end of the air suction pipe (55) is provided with a stop block (81), the stop block (81) and the air suction pipe (55) are provided with a spring (82), and the stop block (81) can be separated from the pipe opening of the air suction pipe (55) under the negative pressure adsorption of the air chamber of the Venturi tube (51) and overcome the force of the spring (82).

2. The dosing device for sewage treatment according to claim 1, characterized by The top of the storage tank (20) is coaxially and rotationally provided with a cover (21), and the cover (21) is rotationally arranged on the partition plate (11), and the bottom of the storage tank (20) is fixedly provided with an inner barrel (23).

3. The dosing device for sewage treatment according to claim 2, characterized by The bottom seat (41) is internally rotatably assembled with a reciprocating screw rod (42), the top end of the reciprocating screw rod (42) extends to the outside of the buffer tank (30) and is rotatably assembled on the partition plate (11), a sliding block (43) is arranged outside the reciprocating screw rod (42) and can slide up and down when the reciprocating screw rod (42) rotates, the sliding block (43) is fixed with the sealing disc (31), the top end of the reciprocating screw rod (42) is fixedly installed with a transmission gear (421), the outer side of the cover (21) is coaxially fixed with a gear ring (211), and the gear ring (211) is engaged with the transmission gear (421).

4. The dosing device for sewage treatment according to claim 3, characterized by The end of the air suction pipe (55) away from the Venturi tube (51) penetrates through the storage tank (20) and extends into the inner cylinder (23), the side wall of the air suction pipe (55) is provided with a notch in the storage tank (20), the auger conveying shaft (61) is fixedly installed with a driven bevel gear (611) in the inner cylinder (23), and one side of the driven bevel gear (611) is engaged with a driving bevel gear (612) rotatably assembled on the top of the inner cylinder (23).

5. The dosing device for sewage treatment according to claim 4, characterized by The bottom of the cover (21) is coaxially fixed with a rotating shaft (71) in the storage tank (20), and the bottom end of the rotating shaft (71) is fixed with the driving bevel gear (612), the outer side of the rotating shaft (71) is slidably assembled with a sliding sleeve (72), and the side wall of the sliding sleeve (72) is fixedly installed with stirring blades (73).

6. The dosing device for sewage treatment according to claim 5, characterized by The stirring blades (73) are fixedly connected with connecting rods (731), the inner wall of the storage tank (20) is coaxially fixed with a guide ring (24), the inner part of the guide ring (24) is provided with a wave-shaped undulating groove (25), and one end of the connecting rod (731) away from the stirring blades (73) is slidably assembled in the undulating groove (25).

7. A method of dosing for sewage treatment, which is suitable for the dosing device for sewage treatment according to claim 6, characterized by, The method comprises the following steps: Step one: inject sewage into the water storage cavity (12) and fill the storage tank (20) with medicine powder; Step two: drive the cover (21) to rotate, drive the reciprocating screw rod (42) to rotate, and at the same time drive the rotating shaft (71) to drive the stirring blades (73) and the auger conveying shaft (61) to rotate; Step three: the reciprocating screw rod (42) drives the sealing disc (31) to lift, negative pressure is drawn in the buffer tank (30), the first one-way valve (35) is opened, and the sewage in the water storage cavity (12) is pumped into the buffer tank (30) through the communication pipe (34); Step four: the reciprocating screw rod (42) drives the sealing disc (31) to descend to pressurize the sewage, the second one-way valve (54) is opened, and the sewage is pressed into the Venturi tube (51) through the water inlet pipe (52) and the spray head (53); Step five: negative pressure is formed in the conical air cavity of the Venturi tube (51), the suction block (81) is away from the port of the air suction pipe (55), and the medicine powder is sucked into the air cavity from the port of the air suction pipe (55); Step six: the medicine powder and the sewage enter the mixing and diffusion chamber together to complete mixing, and then are gathered by the drainage cavity (14).

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