A multi-stage dosing device and method for a concentrated liquid flocculation tank

Abstract

This invention discloses a multi-stage dosing device and method for a concentrated liquid flocculation tank, relating to the technical field of dosing equipment. It includes: a fixed frame, disposed on the top of the tank, with a track rod fixedly connected to the end of the fixed frame, and a housing slidably connected to the track rod; a ring-shaped airbag fixedly connected to the top edge of the housing; a dosing device, arranged in a circumferential array on the housing, comprising: a ring pipe, with a delivery pipe circumferentially connected to the ring pipe, one end of the delivery pipe connected to the ring pipe and the other end fixedly connected to the housing and extending into the tank; an inlet device for supplying the drug solution to the ring pipe; and a slow-release device, arranged in a circumferential array on the housing, with an opening and closing device on the housing for adjusting the drug output of the slow-release device.

Description

Technical Field

[0001] This invention relates to the field of dosing equipment technology, specifically to a multi-stage dosing device and method for a concentrated liquid flocculation tank. Background Technology

[0002] In liquid treatment processes such as wastewater treatment, industrial wastewater treatment, and slurry thickening, it is common practice to add coagulants, flocculants, or polymeric flocculants to flocculation tanks or reaction tanks to promote the flocculation and sedimentation of suspended particles in the water, thereby improving solid-liquid separation efficiency. In existing technologies, chemicals are typically delivered to a dosing pipeline via a metering pump, and then transported to the flocculation tank through the dosing pipeline. The chemical solution is then added to the tank through a spray pipe, distribution pipe, or simple outlet, allowing it to mix with the liquid in the tank under the action of a flow field created by a stirring device, thus completing the flocculation reaction. To improve the uniformity of chemical distribution within the tank, some devices also install annular spray pipes, perforated pipes, or distribution pipes at the end of the dosing pipeline, allowing the chemical solution to enter the water simultaneously from multiple locations, thereby improving the chemical diffusion effect.

[0003] However, in actual operation, the aforementioned traditional dosing methods still have certain limitations. First, existing dosing structures typically use fixed nozzles or perforated pipes for dosing, often resulting in concentrated spraying of the chemical solution from a few outlets. This can easily lead to high-concentration areas in localized regions, while the concentration of the chemical solution is lower in areas far from the outlets, resulting in uneven flocculation and affecting the treatment effect. Second, the liquid level, influent flow rate, and flow field state in the flocculation tank usually change during operation. Traditional dosing systems mostly control the dosage manually by adjusting valves or using electrical control equipment, making it difficult to dynamically adjust according to changes in the tank's operating conditions. This can easily lead to problems of overdosing or underdosing. Furthermore, in some cases requiring the addition of polymeric flocculants, if the chemical solution enters the water body at a high flow rate, it may cause excessively high local concentrations of the chemical, resulting in clumping.

[0004] Therefore, we propose a multi-stage dosing device and method for a concentrated liquid flocculation tank. Summary of the Invention

[0005] The purpose of this invention is to provide a multi-stage dosing device and method for a concentrated liquid flocculation tank, so as to solve at least one of the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A multi-stage dosing device for a concentrated liquid flocculation tank includes: a fixed frame and a dosing device; A fixed frame is installed on the top of the pool. A track rod is fixedly connected to the end of the fixed frame. A shell is slidably connected to the track rod. An annular airbag is fixedly connected to the top edge of the shell. The dosing device is arranged in a circumferential array on the housing. The dosing device includes: a ring tube and a slow-release device. The annular tube is connected to a circular array of infusion tubes. One end of the infusion tube is connected to the annular tube, and the other end is fixedly connected to the shell and extends into the pool. The annular tube is equipped with an inlet device for delivering the medicine to the annular tube. The sustained-release devices are arranged in a circumferential array on the housing, and the housing is equipped with an opening and closing device for adjusting the amount of drug dispensed by the sustained-release device.

[0007] Preferably, the shell has an overall inverted conical structure that is larger at the top and smaller at the bottom, and the side walls of the shell are curved surfaces.

[0008] Preferably, the liquid inlet device includes: a straight pipe and a flexible adjusting pad; The bottom of the straight pipe is connected to the annular pipe, and the inner wall of the straight pipe has a circular arc surface structure. A flexible adjusting pad is set on the inner wall of the straight pipe, and the upper and lower edges of the flexible adjusting pad are sealed to the straight pipe. An air chamber is formed between the flexible adjusting pad and the inner wall of the straight pipe. A channel is opened on the side wall of the straight pipe, and an air pipe is fixedly connected to the channel. An air cushion valve is slidably connected to the inner wall of the air pipe. A connecting rod is fixedly connected to one side of the air cushion valve. A sliding wheel is rotatably connected to the end of the connecting rod. An inclined rail is fixedly connected to the track rod, and the sliding wheel rolls against the inclined rail.

[0009] Preferably, the sustained-release device includes: a second annular tube, a sustained-release chamber, a through hole, and a drug inlet tube; The second annular tube is mounted on the housing; The slow-release chambers are arranged in an array along the circumference of the second annular tube. The slow-release chambers are connected to the second annular tube, and the slow-release chambers are fixedly connected to the shell and communicate with the inside of the pool. The through holes are formed on the outer wall of the slow-release chamber, and the through holes are evenly distributed on the surface of the slow-release chamber; The drug inlet tube is located at the top of the second annular tube and is connected to the second annular tube.

[0010] Preferably, the through holes are microporous structures evenly distributed on the outer wall of the slow-release chamber, with multiple through holes dispersed along the outer surface of the slow-release chamber, and each through hole is connected to the interior of the slow-release chamber, so that the drug solution entering the slow-release chamber can be gradually released into the pool through the through holes.

[0011] Preferably, the opening and closing device includes: a rotating component and a baffle plate; The rotating component is rotatably connected to the housing; The baffle is fixedly connected to the rotating part. The number of baffles is equal to that of the slow-release chamber and they are distributed along the circumference of the rotating part. A limiter is fixedly connected to the rotating part. An inclined groove is opened on the track rod, and the limiter is slidably connected to the inclined groove.

[0012] Preferably, the baffle is positioned on the outside of the sustained-release chamber. When the rotating component rotates, it drives the baffle to rotate relative to the through hole of the sustained-release chamber, thereby changing the exposed area of ​​the through hole and adjusting the drug output of the sustained-release chamber.

[0013] A multi-stage dosing method for a concentrated liquid flocculation tank, applicable to the dosing device described in any of the claims: S1. Install the dosing device on the top of the flocculation tank, so that the shell is slidably connected to the fixed frame through the track rod, and the annular airbag is located at the liquid surface in the tank. S2. The liquid medicine enters the first ring pipe through the inlet device and is then injected into the pool through the delivery pipe for primary dosing. S3. The liquid medicine enters the second annular pipe through the inlet pipe and then enters multiple slow-release chambers; S4. The drug solution in the slow-release chamber is gradually released into the pool through the through-hole to achieve two-stage slow-release drug dosing; S5. When the housing moves along the track rod, the limiting component slides along the inclined groove and drives the rotating component to rotate, thereby driving the baffle plate to change the exposed area of ​​the through hole of the sustained-release chamber, so as to adjust the drug output of the sustained-release chamber.

[0014] This invention has at least the following beneficial effects: 1. By utilizing the circulating flow field created by the stirring device within the flocculation tank, and combining a jet-type dosing structure with a slow-release dosing structure, the chemical solution can diffuse stepwise in different flow zones after entering the tank. Specifically, the jet-type dosing structure formed by the annular pipe and the delivery pipe allows the chemical solution to diffuse rapidly in the central upward flow zone, while the slow-release device gradually releases the chemical solution through the microporous structure on the slow-release chamber, continuously replenishing the chemical solution in the surface diffusion zone and allowing it to flow back along the tank wall into the lower part of the tank, thus creating a more uniform chemical solution distribution. 2. By designing the shell as an inverted cone structure with arc-shaped sidewalls, not only can the shell's interference with the circulating flow field within the tank be reduced, but the released chemicals from both spray and slow-release dosing can also more easily diffuse along the liquid flow direction. Specifically, after the chemical solution enters the vicinity of the liquid surface in the upflow region, it can diffuse radially towards the surrounding area of ​​the tank along the liquid surface, and further flow back down along the tank wall, thus forming a relatively uniform chemical solution distribution within the tank. This improves the contact efficiency between the chemical solution and suspended particles, enhancing the flocculation reaction effect. 3. By placing a flexible adjusting pad on the inner wall of the straight pipe and using an air cushion valve to control the gas pressure in the inflation chamber, the flow rate of the liquid can be adjusted without directly changing the pipeline structure. Simultaneously, the cooperation between the sliding wheel and the inclined rail allows this adjustment process to be linked to the movement of the housing. When the housing moves along the track rod due to changes in liquid level, the effective flow area of ​​the straight pipe is automatically changed, thereby achieving adaptive adjustment of the spray dosage. This enables the device to automatically adjust the dosage according to changes in the liquid level and flow state in the pool, ensuring more efficient diffusion of the liquid in the central upward flow region. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the top view structure of the present invention; Figure 3 This is a schematic diagram of the bottom view structure of the present invention; Figure 4 This is a schematic cross-sectional view of the present invention; Figure 5 This is a schematic diagram of the liquid inlet device of the present invention; Figure 6 This is a schematic diagram of the opening and closing device of the present invention.

[0016] In the diagram: 10. Fixing frame; 11. Track rod; 12. Housing; 13. Annular airbag; 20. Dosing device; 21. Annular tube one; 22. Infusion tube; 23. Inlet device; 30. Sustained-release device; 31. Annular tube two; 32. Sustained-release chamber; 33. Inlet tube; 40. Opening and closing device; 41. Rotating component; 42. Baffle plate; 43. Limiting component; 44. Inclined groove; 231. Straight tube; 232. Flexible adjusting pad; 233. Channel; 234. Air tube; 235. Air cushion valve; 236. Connecting rod; 237. Sliding wheel; 238. Inclined rail. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Please see Figure 1-6 The present invention provides a technical solution: a multi-stage dosing device for a concentrated liquid flocculation tank, comprising: a fixing frame and a dosing device; A fixed frame 10 is installed on the top of the pool. A track rod 11 is fixedly connected to the end of the fixed frame 10. A housing 12 is slidably connected to the track rod 11. An annular airbag 13 is fixedly connected to the top edge of the housing 12. The dosing device 20 is arranged in a circumferential array on the housing 12. The dosing device 20 includes: an annular tube and a slow-release device. An infusion tube 22 is connected to the annular tube 21 in a circular array. One end of the infusion tube 22 is connected to the annular tube 21, and the other end is fixedly connected to the shell 12 and extends into the pool. An inlet device 23 for delivering medicine to the annular tube 21 is provided on the annular tube 21. The sustained-release device 30 is arranged in a circumferential array on the housing 12, and the housing 12 is provided with an opening and closing device 40, which is used to adjust the amount of drug dispensed by the sustained-release device 30.

[0019] It should be noted that in practical applications, a stirring device is usually installed at the bottom of the concentrated liquid flocculation tank. When the stirring device is running, the liquid in the tank will form a circulating flow state under the stirring action. That is, the liquid in the tank flows upward in the middle area of ​​the tank, diffuses to the surroundings near the liquid surface, and then flows back downward along the inner wall of the tank, thus forming a circulating flow field in the tank. The multi-stage dosing device in this embodiment is designed to work in conjunction with the above-mentioned flow field structure.

[0020] Specifically, the shell 12 is slidably connected to the fixed frame 10 via the track rod 11, and buoyancy is provided by the annular airbag 13, allowing the shell 12 to float up and down with changes in the liquid level in the pool, thus keeping the dosing device close to the liquid surface at all times. The chemical solution enters the annular pipe 21 through the inlet device 23, and is then sprayed into the pool through multiple delivery pipes 22. Because the delivery pipes 22 are located near the rising flow area in the middle of the pool, the sprayed chemical solution can quickly diffuse towards the liquid surface area with the rising liquid flow, thereby achieving rapid dispersion of the chemical solution.

[0021] Meanwhile, the drug solution can also enter the annular tube 31 in the slow-release device 30 and then enter multiple slow-release chambers 32, gradually releasing into the liquid in the pool through the through holes on the outer wall of the slow-release chambers 32. Since the slow-release device 30 is located outside the shell 12 and close to the liquid surface, the released drug solution can gradually distribute around the pool along the flow direction from the liquid surface, and further flow back down the pool wall with the liquid, thus making the drug solution form a more uniform distribution in the pool.

[0022] It is worth noting that by utilizing the circulating flow field formed by the stirring device in the flocculation tank and combining the spray dosing structure with the slow-release dosing structure, the drug solution can diffuse stepwise in different flow areas after entering the tank. Specifically, the spray dosing structure formed by the annular pipe 21 and the delivery pipe 22 enables the drug solution to diffuse rapidly in the central upward flow area, while the slow-release device 30 gradually releases the drug solution through the microporous structure on the slow-release chamber 32, allowing the drug solution to continuously replenish in the surface diffusion area and flow back along the tank wall into the lower part of the tank, thus forming a more uniform drug solution distribution.

[0023] Furthermore, by adjusting the exposed area of ​​the through-holes in the slow-release chamber 32 using the opening and closing device 40, the release rate of the slow-release drug solution can be changed according to the movement of the housing 12 on the track rod 11, ensuring a relatively stable dosing effect under different liquid levels or flow conditions. This not only improves the flocculation reaction efficiency but also reduces floc agglomeration caused by excessively high local drug concentrations.

[0024] As further shown in Figures 2, 3 and 4, it is worth noting that the shell 12 has an overall inverted conical structure that is larger at the top and smaller at the bottom, and the side walls of the shell 12 are curved surfaces.

[0025] It should be noted that the shell 12 adopts an inverted conical structure with a larger upper section and a smaller lower section, and its side walls form an arc-shaped surface. This design allows the shell 12 to better adapt to the circulating flow field inside the flocculation tank. When the stirring device at the bottom of the flocculation tank is operating, the liquid in the tank typically flows upward in the central region and diffuses outwards near the liquid surface, then flows back downwards along the inner wall of the tank, thus forming a circulating flow. With the shell 12 designed as an inverted conical structure, its lower cross-section is smaller and its upper cross-section is larger. When the liquid flows along the outside of the shell 12, it reduces obstruction to the rising fluid, allowing the liquid to smoothly bypass the shell 12 and continue to diffuse towards the liquid surface. Simultaneously, the arc-shaped surface allows the liquid to change its flow direction more smoothly as it flows over the surface of the shell 12, thereby reducing flow resistance and avoiding the formation of significant turbulent areas.

[0026] It is worth noting that by designing the shell 12 as an inverted cone structure with arc-shaped sidewalls, not only can the interference of the shell 12 on the circulating flow field within the pool be reduced, but the released chemicals from both spray and slow-release dosing can also more easily diffuse along the liquid flow direction. Specifically, after the chemical solution enters the vicinity of the liquid surface in the upflow region, it can diffuse radially towards the surrounding area of ​​the pool along the liquid surface and further flow back down along the pool wall, thereby forming a relatively uniform chemical solution distribution within the pool. This improves the contact efficiency between the chemical solution and suspended particles, enhancing the flocculation reaction effect.

[0027] Further, as shown in Figure 5, it is worth noting that the liquid inlet device 23 includes: a straight pipe 231 and a flexible adjusting pad 232; The bottom of the straight pipe 231 is connected to the annular pipe 21, and the inner wall of the straight pipe 231 has a circular arc surface structure. A flexible adjusting pad 232 is disposed on the inner wall of the straight pipe 231, and the upper and lower edges of the flexible adjusting pad 232 are sealed to the straight pipe 231. An air chamber is formed between the flexible adjusting pad 232 and the inner wall of the straight pipe 231. A channel 233 is opened on the side wall of the straight pipe 231. An air pipe 234 is fixedly connected to the channel 233. An air cushion valve 235 is slidably connected to the inner wall of the air pipe 234. A connecting rod 236 is fixedly connected to one side of the air cushion valve 235. A sliding wheel 237 is rotatably connected to the end of the connecting rod 236. An inclined rail 238 is fixedly connected to the track rod 11. The sliding wheel 237 rolls against the inclined rail 238.

[0028] It should be noted that the liquid inlet device 23 is used to regulate the flow rate of the liquid medicine entering the annular tube 21. The liquid medicine first enters the annular tube 21 through the straight tube 231, and is further sprayed into the pool through the infusion tube 22. When the housing 12 moves on the track rod 11, the sliding wheel 237 at the end of the connecting rod 236 rolls along the inclined rail 238, thereby driving the air cushion valve 235 to move in the air pipe 234, allowing gas to enter the inflation chamber formed between the flexible adjusting pad 232 and the straight tube 231 through the channel 233. When the air pressure in the inflation chamber increases, the flexible adjusting pad 232 bulges into the straight tube 231, thereby reducing the effective flow cross-sectional area of ​​the straight tube 231 to regulate the flow rate of the liquid medicine; when the air pressure in the inflation chamber decreases, the flexible adjusting pad 232 returns to its original shape, increasing the flow cross-sectional area of ​​the straight tube 231, thereby increasing the flow rate of the liquid medicine.

[0029] It is worth noting that by placing the flexible adjusting pad 232 on the inner wall of the straight pipe 231 and using the air cushion valve 235 to control the gas pressure in the inflation chamber, the flow rate of the liquid can be adjusted without directly changing the pipeline structure. Simultaneously, the cooperation between the sliding wheel 237 and the inclined rail 238 allows this adjustment process to be linked to the movement of the housing 12. When the housing 12 moves along the track rod 11 due to changes in liquid level, the effective flow area of ​​the straight pipe 231 is automatically changed, thereby achieving adaptive adjustment of the spray dosage. This enables the device to automatically adjust the dosage according to changes in the liquid level and flow state in the pool, allowing for more reasonable diffusion of the liquid in the central upward flow region.

[0030] Further, as shown in Figure 4, it is worth noting that the sustained-release device 30 includes: an annular tube 31, a sustained-release chamber 32, a through hole, and a drug inlet tube 33; Annular tube 2 31 is disposed on housing 12; The slow-release chambers 32 are arranged in an array along the circumferential direction of the second annular tube 31. The slow-release chambers 32 are connected to the second annular tube 31. The slow-release chambers 32 are fixedly connected to the shell 12 and communicate with the inside of the pool. Through holes are formed on the outer wall of the slow-release chamber 32, and the through holes are evenly distributed on the surface of the slow-release chamber 32; The drug inlet tube 33 is located at the top of the annular tube 2 31 and is connected to the annular tube 2 31.

[0031] It should be noted that the inlet pipe 33 is used to deliver the drug solution to the annular pipe 31. After entering the annular pipe 31, the drug solution can be distributed circumferentially along the annular pipe 31 and further enter multiple slow-release chambers 32. Since the slow-release chambers 32 are arranged in an array along the circumference of the annular pipe 31, the drug solution can form multiple slow-release points around the shell 12. The outer wall of the slow-release chamber 32 is provided with multiple evenly distributed through holes. When the drug solution enters the slow-release chamber 32, it can be gradually released into the pool through the through holes, thus forming a slow-release dosing method. Since the slow-release chamber 32 is fixedly connected to the shell 12 and located in the area close to the liquid surface, when the liquid in the pool flows upward from the center under the action of stirring and diffuses to the surroundings near the liquid surface, the drug solution released through the slow-release chamber 32 can be gradually distributed to the surroundings of the pool with the diffusion flow at the liquid surface, and further flow back down along the pool wall with the liquid, thus forming a more uniform drug solution distribution in the pool.

[0032] It is worth noting that by setting up the annular pipe 31 and multiple circumferentially distributed slow-release chambers 32, multiple slow-release points can be formed around the shell 12, and the liquid can be gradually released into the pool through the through holes, thus avoiding the liquid from entering the pool all at once and causing excessively high local concentrations. At the same time, because the slow-release chambers 32 cooperate with the circulating flow field inside the flocculation tank, the liquid can be continuously replenished in the diffusion zone on the liquid surface and flow back into the lower part of the pool along the pool wall, thus forming a more uniform distribution of the liquid. This not only improves the contact efficiency between the liquid and suspended particles, but also reduces the occurrence of local agglomeration of the agent, thereby improving the flocculation reaction efficiency and reducing agent consumption.

[0033] As further shown in Figure 6, it is worth noting that the through holes are microporous structures evenly distributed on the outer wall of the slow-release chamber 32. Multiple through holes are dispersed along the outer surface of the slow-release chamber 32, and each through hole is connected to the interior of the slow-release chamber 32, so that the drug solution entering the slow-release chamber 32 can be gradually released into the pool through the through holes.

[0034] It should be noted that the through-hole adopts a microporous structure, which limits the flow of the drug solution inside the slow-release chamber 32 during the release process, thereby achieving a slow release effect. When the drug solution enters the annular pipe 31 through the inlet pipe 33 and enters the slow-release chamber 32, due to the presence of the microporous structure, the drug solution will not flow out in large quantities at once, but will gradually seep into the liquid in the pool through multiple micropores. Since multiple micropores are dispersed along the outer wall of the slow-release chamber 32, multiple micro-release points can be formed around the slow-release chamber 32, thereby achieving a more uniform drug solution release process.

[0035] Further, as shown in Figure 3, it is worth noting that the opening and closing device 40 includes: a rotating member 41 and a baffle plate 42; Rotating component 41 is rotatably connected to housing 12; The baffle plate 42 is fixedly connected to the rotating part 41. The number of baffle plates 42 and the slow release chamber 32 are equal and distributed along the circumference of the rotating part 41. The rotating part 41 is fixedly connected to the limiting part 43. The track rod 11 is provided with a sloping groove 44. The limiting part 43 is slidably connected to the sloping groove 44.

[0036] It should be noted that the opening and closing device 40 is used to adjust the drug dispensing rate of the sustained-release chamber 32. A rotating component 41 is mounted on the housing 12 and can rotate relative to it. A baffle plate 42 is fixedly connected to the rotating component 41 and distributed circumferentially. When the rotating component 41 rotates, the baffle plate 42 changes its position relative to the through-hole of the sustained-release chamber 32, thereby changing the exposed area of ​​the through-hole. A limiting component 43 is fixedly connected to the rotating component 41 and slidably connected to the inclined groove 44 on the track rod 11. When the housing 12 moves up and down on the track rod 11, the limiting component 43 moves along the inclined groove 44, thereby causing the rotating component 41 to rotate, changing the degree of obstruction of the through-hole of the sustained-release chamber 32 by the baffle plate 42. When the housing 12 moves downwards as the liquid level decreases, the rotating component 41 rotates under the guidance of the inclined groove 44, causing the baffle plate 42 to gradually move away from the through-hole position, thereby increasing the exposed area of ​​the through-hole of the sustained-release chamber 32.

[0037] It is worth noting that when the liquid level in the flocculation tank is low, the shell 12 moves downward on the track rod 11, and the opening and closing device 40 automatically increases the exposed area of ​​the through holes in the slow-release chamber 32, thereby increasing the release amount of the slow-release solution and keeping the concentration of the solution in the tank within a relatively stable range. Simultaneously, under the action of the circulating flow field formed by the bottom stirring device, the released solution can enter the surface diffusion area with the upward flow in the middle and flow back along the tank wall to the lower part of the tank, thus achieving a more uniform distribution of the solution. This not only improves the flocculation reaction efficiency but also avoids a decrease in flocculation effect due to insufficient solution release, thereby improving the overall treatment effect.

[0038] As further shown in Figure 4, it is worth noting that the baffle plate 42 is positioned on the outside of the sustained-release chamber 32. When the rotating component 41 rotates, it drives the baffle plate 42 to rotate relative to the through hole of the sustained-release chamber 32, thereby changing the exposed area of ​​the through hole and adjusting the amount of drug dispensed from the sustained-release chamber 32.

[0039] It should be noted that each baffle plate 42 is positioned on the outer side of a sustained-release chamber 32. When the rotating component 41 rotates, the baffle plate 42 rotates synchronously around the rotating component 41, thereby changing its position relative to the through-hole of the sustained-release chamber 32. As the baffle plate 42 gradually covers the through-hole, the exposed area of ​​the through-hole decreases, thus reducing the drug output of the sustained-release chamber 32; as the baffle plate 42 gradually moves away from the through-hole, the exposed area of ​​the through-hole increases, thus increasing the drug output of the sustained-release chamber 32. This structure allows for continuous adjustment of the sustained-release dosage, enabling the drug output state of the sustained-release device 30 to change with the rotation of the rotating component 41.

[0040] A method for multi-stage dosing of concentrate in a flocculation tank includes the following steps: S1. Install the dosing device on the top of the flocculation tank, so that the shell 12 is slidably connected to the fixed frame 10 through the track rod 11, and the annular airbag 13 is located at the liquid surface in the tank, so that the shell 12 can float up and down with the liquid surface when the liquid level changes, thereby keeping the dosing device in a working position close to the liquid surface. S2. The liquid medicine enters the annular pipe 21 through the liquid inlet device 23 and is injected into the pool through the liquid delivery pipe 22. The injected liquid medicine enters the rising flow area in the middle of the pool and flows upward with the liquid under the action of the circulating flow field formed by the bottom stirring device and diffuses to the surroundings near the liquid surface, thereby achieving rapid dispersion of the liquid medicine. S3. The liquid medicine enters the second annular tube 31 through the inlet tube 33, and is distributed circumferentially along the second annular tube 31 before entering multiple slow-release chambers 32, so that the liquid medicine can form multiple slow-release points around the shell 12. S4. The drug solution in the slow-release chamber 32 is gradually released into the pool through the micropores on the outer wall, so that the drug solution is continuously replenished in the diffusion area of ​​the liquid surface, and flows back into the lower part of the pool along the pool wall, thereby making the drug solution more evenly distributed in the pool and realizing two-stage slow-release dosing. S5. When the shell 12 moves along the track rod 11 with the change of liquid level in the pool, the limiting member 43 slides along the inclined groove 44 and drives the rotating member 41 to rotate, so that the position of the baffle plate 42 relative to the through hole of the slow-release chamber 32 changes, thereby changing the exposed area of ​​the through hole to adjust the amount of drug released from the slow-release chamber 32. When the liquid level is low, the exposed area of ​​the through hole increases to increase the amount of slow-release drug released. When the liquid level is high, the blocked area of ​​the through hole increases to reduce the amount of slow-release drug released, so that the drug addition process can be automatically adjusted according to the change of liquid level in the pool.

[0041] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0042] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, all of which fall within the scope of protection of the present invention.

Claims

1. A multi-stage dosing device for a concentrated liquid flocculation tank, characterized in that, include: A fixed frame (10) is provided on the top of the pool. A track rod (11) is fixedly connected to the end of the fixed frame (10). A housing (12) is slidably connected to the track rod (11). An annular airbag (13) is fixedly connected to the top edge of the housing (12). A dosing device (20), wherein the dosing device (20) is arranged in a circumferential array on the housing (12), and the dosing device (20) includes: A ring tube (21) is connected to an infusion tube (22) in a circular array. One end of the infusion tube (22) is connected to the ring tube (21), and the other end is fixedly connected to the shell (12) and extends into the pool. A liquid inlet device (23) for delivering medicine to the ring tube (21) is provided on the ring tube (21). The sustained-release device (30) is arranged in a circumferential array on the housing (12). The housing (12) is provided with an opening and closing device (40), which is used to adjust the amount of drug dispensed by the sustained-release device (30).

2. The multi-stage dosing device for a concentrated liquid flocculation tank according to claim 1, characterized in that: The shell (12) has an overall inverted cone structure that is larger at the top and smaller at the bottom, and the sidewalls of the shell (12) are arc-shaped curved surfaces.

3. The multi-stage dosing device for a concentrated liquid flocculation tank according to claim 2, characterized in that: The liquid inlet device (23) includes: A straight pipe (231) is connected at its bottom to an annular pipe (21), and the inner wall of the straight pipe (231) is an arc surface structure. A flexible adjusting pad (232) is provided on the inner wall of a straight tube (231), and the upper and lower edges of the flexible adjusting pad (232) are sealed to the straight tube (231). An air-filled cavity is formed between the flexible adjusting pad (232) and the inner wall of the straight tube (231). A channel (233) is opened on the side wall of the straight tube (231). An air pipe (234) is fixedly connected to the channel (233). An air cushion valve (235) is slidably connected to the inner wall of the air pipe (234). A connecting rod (236) is fixedly connected to one side of the air cushion valve (235). A sliding wheel (237) is rotatably connected to the end of the connecting rod (236). An inclined rail (238) is fixedly connected to the track rod (11). The sliding wheel (237) rolls against the inclined rail (238).

4. The multi-stage dosing device for a concentrated liquid flocculation tank according to claim 3, characterized in that: The sustained-release device (30) includes: Annular tube two (31), the annular tube two (31) is disposed on the housing (12); Slow-release chamber (32), the slow-release chamber (32) is arranged in an array along the circumferential direction of the second annular tube (31), the slow-release chamber (32) is connected to the second annular tube (31), the slow-release chamber (32) is fixedly connected to the shell (12) and communicates with the inside of the pool; Through holes are formed on the outer wall of the slow-release chamber (32), and the through holes are evenly distributed on the surface of the slow-release chamber (32); The drug inlet tube (33) is located at the top of the annular tube (31) and is connected to the annular tube (31).

5. A multi-stage dosing device for a concentrated liquid flocculation tank according to claim 4, characterized in that: The through holes are microporous structures evenly distributed on the outer wall of the slow-release chamber (32). Multiple through holes are dispersed along the outer surface of the slow-release chamber (32), and each through hole is connected to the inside of the slow-release chamber (32) so that the drug liquid entering the slow-release chamber (32) can be gradually released into the pool through the through holes.

6. The multi-stage dosing device for a concentrated liquid flocculation tank according to claim 5, characterized in that: The opening and closing device (40) includes: Rotating component (41), which is rotatably connected to housing (12); A shield (42) is fixedly connected to a rotating component (41). The number of shields (42) and the number of slow-release chambers (32) are equal and distributed along the circumference of the rotating component (41). A limiting component (43) is fixedly connected to the rotating component (41). A groove (44) is provided on the track rod (11). The limiting component (43) is slidably connected to the groove (44).

7. The multi-stage dosing device for a concentrated liquid flocculation tank according to claim 6, characterized in that: The shield (42) is disposed on the outside of the sustained-release chamber (32). When the rotating component (41) rotates, it drives the shield (42) to rotate relative to the through hole of the sustained-release chamber (32) to change the exposed area of ​​the through hole, thereby adjusting the amount of drug dispensed from the sustained-release chamber (32).

8. A multi-stage dosing method for a concentrated liquid flocculation tank, applied to the dosing device according to any one of claims 1-7, characterized in that: S1. Install the dosing device on the top of the flocculation tank, so that the shell (12) is slidably connected to the fixed frame (10) through the track rod (11), and the annular airbag (13) is located at the liquid surface in the tank. S2. The liquid medicine enters the first ring pipe (21) through the liquid inlet device (23) and is injected into the pool through the delivery pipe (22) for primary dosing; S3. The liquid medicine enters the second annular tube (31) through the inlet tube (33) and then enters multiple slow-release chambers (32); S4. The liquid medicine in the slow-release chamber (32) is gradually released into the pool through the through hole to achieve two-stage slow-release dosing; S5. When the housing (12) moves along the track rod (11), the limiting member (43) slides along the inclined groove (44) and drives the rotating member (41) to rotate, thereby driving the baffle plate (42) to change the exposed area of ​​the through hole of the sustained release chamber (32) to adjust the amount of drug released from the sustained release chamber (32).

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