Waterworks sewage treatment and recycling dosing device

Abstract

The present application relates to sewage treatment technical field, especially to a tap water plant sewage treatment recycling dosing device, including support foot, mixed medicine bucket, upper cover and driving motor, its characterized in be: the mixed medicine bucket with upper cover detachable connection.The present application, by setting follow-up adjusting unit including air floatation bag on stirring arm, utilizes the dynamic balance of buoyancy and centrifugal force to realize the automatic adjustment of stirring plate position, when liquid level is higher, air floatation bag drives stirring plate to move up, utilizes the smaller force area of stirring plate upper half to adapt low-speed stirring under high liquid level, prevents high polymer medicament (such as PAM) molecular chain from being excessively sheared;When liquid level drops or speed increases, centrifugal force overcomes buoyancy, drives stirring plate to move out and sag, expands stirring radius, this follow-up design can automatically adjust stirring intensity and range according to working condition, both guarantees mixing effect, and effectively reduces motor load, saves energy.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to a dosing device for wastewater treatment and reuse in waterworks. Background Technology

[0002] Waterworks generate a large amount of sludge discharge water and filter backwash wastewater during the water production process, accounting for approximately 3% to 7% of the daily water production. With water scarcity and increasingly stringent environmental regulations, the treatment and reuse of this wastewater has become an industry standard. The reuse process typically requires wastewater to undergo impurity removal, coagulation sedimentation, and disinfection. Among these processes, the chemical mixing device is a key piece of equipment that determines the quality of the reused water and the consumption of chemicals in the main process.

[0003] Currently, for the treatment of reclaimed water in water treatment plants, the industry mostly uses traditional integrated dosing devices or static pipeline mixers. This method involves adding chemicals into the pipeline and using water turbulence for mixing. While this method is simple in structure, the mixing intensity is uncontrollable, and the chemicals tend to adhere to the pipe walls. This is especially true when adding flocculants such as PAC and PAM, which are prone to crystallization and wall adhesion, easily causing pipeline blockage. When dissolving high-molecular-weight chemicals such as PAM (polyacrylamide), existing technologies face a dilemma: low-speed stirring can easily lead to uneven dispersion of the chemicals in the water, forming insoluble granular agglomerates that block subsequent pipelines. Similarly, while high-speed stirring can break up the agglomerates, it can also cut the PAM molecular chains, causing shear degradation and significantly reducing the flocculation effect. In addition, traditional stirring paddles cannot adjust the stirring radius according to changes in liquid level. When the liquid level is low, the chemicals near the tank wall cannot participate in circulation, further exacerbating the uneven concentration.

[0004] Therefore, how to provide a dosing device for wastewater treatment and reuse in waterworks is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a dosing device for wastewater treatment and reuse in waterworks, so as to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a dosing device for wastewater treatment and reuse in waterworks, comprising a support foot, a mixing tank, a top cover, and a drive motor, wherein the mixing tank and the top cover are detachably connected, and further comprising: The agitator shaft is connected to the output shaft of the drive motor, and a conveying blade is provided at its bottom end. When the conveying blade rotates, it conveys the water at the bottom upwards. The annular shell is fixedly installed at the bottom of the mixing tank, the conveying blade is built inside the annular shell, and a through leakage hole is opened on the outer side of the annular shell near the top; The stirring arm is located on the outside of the stirring shaft near the top, and the top of the stirring arm includes a follow-up adjustment unit.

[0007] Furthermore, the top of the cover is provided with a water injection hole for introducing external water into the mixing tank, and the bottom of the mixing tank is provided with a drain outlet.

[0008] Furthermore, the follow-up adjustment unit includes a guide block disposed on the stirring arm, a guide slide rod slidably disposed in the middle of the guide block, a storage shell connected to one end of the guide slide rod near the stirring shaft, an air flotation bag embedded in the top of the storage shell, and a stirring plate rotatably connected to the other end of the guide slide rod through the guide block and extending to the other side of the guide block.

[0009] Furthermore, the stirring plate has an oblique protrusion at the end away from the stirring arm. The stirring plate is made of an elastic plate. A connecting frame is fixedly installed on the side of the stirring plate near the stirring arm. One end of the guide slide rod passes through the guide block and is fixedly connected to the connecting arm plate. A rotating hole is opened in the connecting arm plate at the end away from the guide slide rod. A waterproof bearing is installed in the rotating hole. The stirring plate is rotatably connected to the connecting arm plate through the waterproof bearing. A torsion spring is installed on the inner side of the connecting frame near the waterproof bearing. The torsion spring keeps the stirring plate in a nearly vertical state.

[0010] Furthermore, the connecting frame is disposed on the side of the stirring plate near the stirring shaft, and divides the stirring plate into upper and lower regions, wherein the area of ​​the upper region of the connecting frame is smaller than the area of ​​the lower region.

[0011] Furthermore, a fixing post is connected to the bottom of the annular shell, and the bottom of the fixing post is fixedly connected to the inner wall of the bottom of the mixing tank. The annular shell is connected to the inner wall of the mixing tank through the fixing post.

[0012] Furthermore, the stirring arm and its top follow-up adjustment unit are provided in multiple units, which are evenly spaced and distributed in a ring outside the stirring shaft.

[0013] Furthermore, the outer side and bottom of the annular shell form a channel with the inner wall of the mixing tank, through which the water in the mixing tank enters the bottom of the annular shell and flows upward.

[0014] Furthermore, the stirring plate is disposed on the outside of the annular shell and is spaced apart from the annular shell.

[0015] Furthermore, it also includes a drug mixing mechanism, which consists of an agitator shaft, an agitator arm, a guide block, a guide slide rod, a receiving shell, an air flotation bag, and a connecting arm plate.

[0016] Furthermore, it also includes a connecting mechanism, which consists of a waterproof bearing, a connecting frame, a stirring plate, and an oblique protrusion.

[0017] Furthermore, it also includes a negative pressure conveying mechanism, which consists of a fixed column, a circular housing, a leakage hole, and conveying blades.

[0018] The beneficial effects of this invention are: 1. This invention utilizes a follow-up adjustment unit containing an air flotation bag on the agitator arm to automatically adjust the position of the agitator plate by leveraging the dynamic balance between buoyancy and centrifugal force. When the liquid level is high, the air flotation bag drives the agitator plate to move upward, using the smaller force-bearing area of ​​the upper half of the agitator plate to adapt to low-speed stirring at high liquid levels, preventing excessive shearing of polymeric agents (such as PAM) molecular chains. When the liquid level drops or the rotation speed increases, centrifugal force overcomes buoyancy, driving the agitator plate to move outward and droop, expanding the stirring radius. This follow-up design can automatically adjust the stirring intensity and range according to the working conditions, ensuring the mixing effect while effectively reducing the motor load and saving energy. 2. This invention constructs a three-dimensional circulating flow channel within the mixing tank by setting up an annular shell with conveying blades. The strong upward thrust generated when the conveying blades rotate forces the water inside the annular shell to rise, while external water is replenished from the bottom channel, forming a continuous internal circulation. Combined with the diversion effect of the stirring plate on the water flow, the contact time and probability between the agent and the water are greatly increased, effectively solving the problems of bottom sedimentation and top foaming in traditional stirring equipment, and ensuring the uniformity of the drug concentration. 3. This invention addresses the characteristics of high viscosity and easy adhesion of polymeric agents by incorporating oblique protrusions on the stirring plate. Utilizing centrifugal force during high-speed rotation, the stirring plate expands outward and comes into close contact with the inner wall of the mixing tank. During rotation, the oblique protrusions forcefully scrape away the sticky drug clumps adhering to the tank wall and the outer wall of the annular shell. Simultaneously, the enhanced negative pressure suction at the bottom draws the scraped drug clumps into the annular shell, where they are further broken up by the high-speed impact of the conveying blades. This prevents ineffective drug loss and scaling / clogging inside the equipment, ensuring the accuracy of the dosage ratio. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the overall structure of a chemical dosing device for wastewater treatment and reuse in a waterworks, as proposed in this invention. Figure 2 This is a cross-sectional front view of a dosing device for wastewater treatment and reuse in a waterworks, as proposed in this invention. Figure 3 This is an enlarged structural schematic diagram of the stirring arm of a dosing device for wastewater treatment and reuse in a waterworks, as proposed in this invention. Figure 4 This is a schematic diagram of the conveying blade structure of a chemical dosing device for wastewater treatment and reuse in a waterworks, as proposed in this invention. Figure 5 This is a schematic diagram of the internal structure of the annular shell of a dosing device for wastewater treatment and reuse in a waterworks, as proposed in this invention. Figure 6 This is a schematic diagram of the exploded structure of the connecting frame of a chemical dosing device for wastewater treatment and reuse in a waterworks, as proposed in this invention.

[0020] In the diagram: 1. Support foot; 2. Mixing tank; 3. Top cover; 4. Drive motor; 5. Mixing mechanism; 501. Stirring shaft; 502. Stirring arm; 503. Guide block; 504. Guide slide rod; 505. Storage shell; 506. Air flotation bag; 507. Connecting arm plate; 6. Connecting mechanism; 601. Waterproof bearing; 602. Connecting frame; 603. Stirring plate; 604. Slanted protrusion; 7. Negative pressure conveying mechanism; 701. Fixed column; 702. Circular shell; 703. Leakage hole; 704. Conveying blade. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0022] Example 1: Reference Figures 1-6 The present invention provides a technical solution: a dosing device for wastewater treatment and reuse in a waterworks, comprising a support leg 1, a mixing tank 2, a top cover 3, and a drive motor 4, wherein the mixing tank 2 and the top cover 3 are detachably connected, and further comprising: The stirring shaft 501 is connected to the output shaft of the drive motor 4, and a conveying blade 704 is provided at its bottom end. When the conveying blade 704 rotates, it conveys the water at the bottom upward. The annular housing 702 is fixedly installed at the bottom of the mixing tank 2. The conveying blade 704 is built inside the annular housing 702. A through leakage hole 703 is opened on the outer side of the annular housing 702 near the top. The stirring arm 502 is located on the outside of the stirring shaft 501 near the top, and the top of the stirring arm 502 includes a follow-up adjustment unit.

[0023] Those skilled in the art will know that, in order to determine the liquid level in the mixing tank 2, a liquid level sensor is provided inside the mixing tank 2. At the same time, the mixing tank 2 and the top cover 3 are detachably connected by a sealing device. For example, any detachable method other than locking or bolt fixing should fall within the protection scope of this invention.

[0024] It can be determined that by setting the stirring arm 502 to be driven by the drive motor 4, and at the same time the follow-up adjustment unit adaptively adjusts, the overall drug mixing efficiency is enhanced, and by setting the annular shell 702, the upward flow rate of the bottom of the mixing tank 2 can be increased.

[0025] Example 2: Reference Figure 3 and Figure 6 Based on Embodiment 1, the present invention provides a technical solution: the top of the cover 3 is provided with a water injection hole, which is used to introduce external water into the mixing tank 2, and the bottom of the mixing tank 2 is provided with a drain outlet.

[0026] The follow-up adjustment unit includes a guide block 503 set on the stirring arm 502. A guide slide rod 504 is slidably set in the middle of the guide block 503. One end of the guide slide rod 504 near the stirring shaft 501 is connected to a storage shell 505. An air flotation bag 506 is embedded in the top of the storage shell 505. The other end of the guide slide rod 504 passes through the guide block 503 and extends to the other side of the guide block 503, where it is rotatably connected to a stirring plate 603.

[0027] The stirring plate 603 has an oblique protrusion 604 at the end away from the stirring arm 502. The stirring plate 603 is made of elastic plate. A connecting frame 602 is fixedly installed on the side of the stirring plate 603 near the stirring arm 502. One end of the guide slide rod 504 passes through the guide block 503 and is fixedly connected to the connecting arm plate 507. A rotating hole is opened in the connecting arm plate 507 at the end away from the guide slide rod 504. A waterproof bearing is installed in the rotating hole. The stirring plate 603 is rotatably connected to the connecting arm plate 507 through the waterproof bearing. A torsion spring is installed on the inner side of the connecting frame 602 near the waterproof bearing. The torsion spring keeps the stirring plate 603 in a vertical state.

[0028] The connecting frame 602 is located on the side of the stirring plate 603 near the stirring shaft 501, and divides the stirring plate 603 into upper and lower regions, wherein the area of ​​the upper region of the connecting frame 602 is smaller than the area of ​​the lower region.

[0029] Multiple stirring arms 502 and their top follow-up adjustment units are provided, and are evenly spaced and distributed in a ring outside the stirring shaft 501.

[0030] It also includes a mixing mechanism 5, which consists of an agitator 501, an agitator arm 502, a guide block 503, a guide slide rod 504, a storage shell 505, an air flotation bag 506, and a connecting arm plate 507.

[0031] It also includes a connecting mechanism 6, which consists of a waterproof bearing 601, a connecting frame 602, a stirring plate 603, and an oblique protrusion 604.

[0032] It is worth mentioning that the connection method between the connecting arm plate 507 and the connecting frame 602 in the follow-up adjustment unit is not limited to the connection by using a torsion spring and a sealed bearing. Any structure that can keep the stirring plate 603 in a nearly vertical state should fall within the protection scope of this invention.

[0033] Furthermore, it can be determined that this embodiment provides a specific structure capable of adaptive and follow-up expansion. By setting the expansion and contraction state switching of the stirring plate 603, it can adaptively change the liquid level in the mixing tank 2 when it is high or low, so as to adapt to the effect when used at different stages.

[0034] Example 3: Reference Figure 4 and Figure 5 Based on Embodiment 2, the present invention provides a technical solution: a fixing post 701 is connected to the bottom of the annular shell 702, the bottom of the fixing post 701 is fixedly connected to the inner wall of the bottom of the mixing tank 2, and the annular shell 702 is connected to the inner wall of the mixing tank 2 through the fixing post 701. The outer side and bottom of the annular shell 702 form a channel with the inner wall of the mixing tank 2, and the water in the mixing tank 2 enters the bottom of the annular shell 702 through the channel and flows upward.

[0035] The stirring plate 603 is disposed on the outside of the annular shell 702 and is spaced apart from the annular shell 702.

[0036] It also includes a negative pressure conveying mechanism 7, which consists of a fixed column 701, an annular housing 702, a leakage hole 703, and a conveying blade 704.

[0037] Furthermore, this embodiment provides a specific structure that can accelerate the flow of water inside the mixing tank 2. By rotating the conveying blade 704, the upward flow rate inside the annular shell 702 can be accelerated.

[0038] Working principle: After the device is started, the concentration and dosage of the reagent are preset according to the treatment volume and water quality parameters of the wastewater to be treated. The liquid level sensor detects the water level in the mixing tank 2 in real time. When preparing polymeric reagents such as PAM, a high-pressure water flow is injected into the top of the mixing tank 2 to initially disperse the added dry powder and prevent the dry powder from agglomerating into clumps. As the liquid level rises, the air flotation bag 506 in the receiving shell 505 floats upward under the action of buoyancy. Since its bottom is limited by the guide block 503, the receiving shell 505 moves upward along the inclined surface of the stirring arm 502. The connecting arm plate 507 and the stirring plate 603 at the other end of the receiving shell 505 move to a position close to the outer wall of the annular shell 702, controlling the drive motor 4 to work, so that the stirring shaft 501 is lowered. The agitator rotates rapidly, simultaneously dispersing the mixed dry powder and water to prevent clumping. As the agitator shaft 501 rotates, it drives the conveyor blades 704 connected to the bottom to rotate. The water flowing outside the annular shell 702 flows upward through the bottom channel inside the annular shell 702. Part of the mixed water is discharged through the drain hole 703 on the annular shell 702, while the other part flows upward along the agitator shaft 501. When it reaches the upper side of the annular shell 702, it is diverted back to the side near the inner wall of the mixing tank 2 in conjunction with the rotation of the agitator plate 603 when the agitator shaft 501 rotates. There, it comes into contact with the agitator plate 603 for secondary mixing, improving the mixing effect of the dry powder, avoiding excessive breakage of the molecular chains of the polymer agent, and preventing a decrease in the subsequent flocculation effect.

[0039] As the mixing time increases, the control drive motor 4 drives the stirring shaft 501 to rotate at high speed. Under the action of centrifugal force, the guide slide rod 504 overcomes the buoyancy of the air flotation bag 506 rising in the water, causing it to move away from the stirring shaft 501 within the guide block 503. At the same time, it pushes the stirring plate 603 to contact the inner wall of the mixing tank 2. The slanted protrusions 604 on the stirring plate 603 scrape off the sticky drug clumps attached to the mixing tank 2. When the stirring shaft 501 rotates at high speed, the conveying blade 704 at its bottom rotates at high speed simultaneously, which increases the upward negative pressure at the conveying blade 704 and accelerates the flow speed of the water outside the annular shell 702 into the annular shell 702. This allows the sticky drug clumps to be sucked in from the bottom of the annular shell 702. When they come into contact with the conveying blade 704, the conveying blade 704 impacts and breaks up the drug clumps, improving the overall mixing quality.

[0040] As the liquid in the mixing tank 2 gradually drains out through the bottom drain port, the liquid level in the mixing tank 2 decreases. During this descent, the water in the mixing tank 2 cannot effectively provide buoyancy to the air flotation bag 506 inside the receiving shell 505. As a result, the receiving shell 505 gradually slides downward on the inclined surface of the stirring arm 502, causing the stirring plate 603 and the inclined protrusion 604 to naturally hang down at the other end of the connecting arm plate 507. At the same time, the stirring plate 603 gradually moves closer to the inner wall of the mixing tank 2. The drive motor 4 drives the stirring shaft 501 to rotate, which in turn drives the stirring plate 603 to rotate inside the mixing tank 2. By reducing the resistance to buoyancy of the air flotation bag 506, the load on the mixing mechanism 5 is reduced. Under the action of centrifugal force, the stirring plate 603 attempts to fill the area between the inclined protrusions 604 with its elastic surface. This allows for secondary scraping of some blind spots that existed in the previous steps, preventing the precipitation of the various components of the medicine in the mixing tank 2 during the delivery of the medicine.

[0041] By setting a leakage hole 703 on the annular shell 702, some drug clumps that can pass through the leakage hole 703 are assumed to be ready for direct use, while drug clumps that cannot pass through the leakage hole 703 will be repeatedly broken up in the mixing tank 2 until they can be returned through the leakage hole 703. Since the water flow velocity inside the annular shell 702 is higher than that outside the annular shell 702, it effectively avoids the adhesion of sticky drug clumps to the inner wall of the annular shell 702, making the device easy to maintain.

[0042] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A dosing device for wastewater treatment and reuse in a waterworks, comprising a support foot (1), a mixing tank (2), a top cover (3), and a drive motor (4), characterized in that: The mixing tank (2) is detachably connected to the top cover (3), and also includes: The stirring shaft (501) is connected to the output shaft of the drive motor (4), and a conveying blade (704) is provided at its bottom end. When the conveying blade (704) rotates, it conveys the bottom water upward. The annular shell (702) is fixedly installed at the bottom of the mixing tank (2), and the conveying blade (704) is built inside the annular shell (702). A through leakage hole (703) is opened on the outer side of the annular shell (702) near the top. A stirring arm (502) is located on the outside of the stirring shaft (501) near the top, and the top of the stirring arm (502) includes a follow-up adjustment unit.

2. The dosing device for wastewater treatment and reuse in a waterworks according to claim 1, characterized in that: The top of the cover (3) is provided with a water injection hole, which is used to introduce external water into the mixing tank (2). The bottom of the mixing tank (2) is provided with a drain outlet.

3. The dosing device for wastewater treatment and reuse in a waterworks according to claim 2, characterized in that: The follow-up adjustment unit includes a guide block (503) disposed on the stirring arm (502). A guide slide rod (504) is slidably disposed in the middle of the guide block (503). A storage shell (505) is connected to one end of the guide slide rod (504) near the stirring shaft (501). An air flotation bag (506) is embedded in the top of the storage shell (505). The other end of the guide slide rod (504) passes through the guide block (503) and extends to the other side of the guide block (503) where a stirring plate (603) is rotatably connected.

4. The dosing device for wastewater treatment and reuse in a waterworks according to claim 3, characterized in that: The stirring plate (603) has an oblique protrusion (604) at the end away from the stirring arm (502). The stirring plate (603) is made of elastic plate. A connecting frame (602) is fixedly installed on the side of the stirring plate (603) near the stirring arm (502). One end of the guide slide rod (504) passes through the guide block (503) and is fixedly connected to the connecting arm plate (507). A rotating hole is opened in the connecting arm plate (507) at the end away from the guide slide rod (504). A waterproof bearing is installed in the rotating hole. The stirring plate (603) is rotatably connected to the connecting arm plate (507) through the waterproof bearing. A torsion spring is installed on the inner side of the connecting frame (602) near the waterproof bearing. The torsion spring keeps the stirring plate (603) in a vertical position.

5. A dosing device for wastewater treatment and reuse in a waterworks according to claim 4, characterized in that: The connecting frame (602) is located on the side of the stirring plate (603) near the stirring shaft (501) and divides the stirring plate (603) into upper and lower regions, wherein the area of ​​the upper region of the connecting frame (602) is smaller than the area of ​​the lower region.

6. The dosing device for wastewater treatment and reuse in a waterworks according to claim 5, characterized in that: The bottom of the annular shell (702) is connected to a fixing post (701), the bottom of the fixing post (701) is fixedly connected to the inner wall of the bottom of the mixing tank (2), and the annular shell (702) is connected to the inner wall of the mixing tank (2) through the fixing post (701).

7. A dosing device for wastewater treatment and reuse in a waterworks according to claim 6, characterized in that: The stirring arm (502) and its top follow-up adjustment unit are provided in multiple ways, and are evenly spaced and distributed in a ring outside the stirring shaft (501).

8. A dosing device for wastewater treatment and reuse in a waterworks according to claim 7, characterized in that: The outer side and bottom of the annular shell (702) form a channel with the inner wall of the mixing tank (2), and the water in the mixing tank (2) enters the bottom of the annular shell (702) through the channel and flows upward.

9. A dosing device for wastewater treatment and reuse in a waterworks according to claim 8, characterized in that: The stirring plate (603) is disposed on the outside of the annular shell (702) and is spaced apart from the annular shell (702).

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