A device for homogeneous preparation and continuous injection of an anti-swelling agent

Abstract

The application discloses an anti-swelling agent homogenizing and dispensing and continuous injection device and relates to the technical field of oil exploitation. The anti-swelling agent homogenizing and dispensing and continuous injection device comprises a tee pipe, the tee pipe comprises a vertical pipe section and a horizontal pipe section intersecting with the vertical pipe section, and the horizontal pipe section is connected in series in a water injection main pipeline; a dispensing unit is arranged in the vertical pipe section and comprises an inner shell, at least two groups of mixing chambers are arranged in the inner shell, the mixing chambers are arranged in an axial direction of the vertical pipe section, and an inner container concentric with the mixing chambers is fixed in each mixing chamber. The anti-swelling agent homogenizing and dispensing and continuous injection device solves the problem that, in the process of stirring and diluting anti-swelling agent concentrated liquid and clean water, a stirring gap inevitably exists between the blade of a conventional stirrer and the inner wall of a container, under the action of centrifugal force, the fluid in an edge region is difficult to be effectively entrained into a main flow area, a stirring dead zone is formed, local medicament concentration is uneven, and the homogenizing effect is affected.

Description

Technical Field

[0001] This invention relates to the field of oil extraction technology, specifically to a device for homogenizing and continuously injecting an anti-swelling agent. Background Technology

[0002] In the later stages of oil extraction, as formation energy depletes and remaining oil becomes increasingly difficult to extract, water injection equipment is often used to inject high-pressure water into the target formation to replenish formation energy, displace remaining oil, reduce extraction difficulty, and improve recovery rate.

[0003] During water injection, water-sensitive substances such as clay minerals in the strata undergo hydration and expansion upon contact with water, leading to blockage of the injection channels and a decrease in permeability. Therefore, it is necessary to add anti-swelling agents to the injected water to inhibit clay expansion, stabilize the channel walls, and ensure the normal progress of water injection. Currently, commonly used anti-swelling agents are mainly available in two forms: solid powder and liquid concentrate. Among them, liquid anti-swelling agents only need to be diluted with water according to the specified ratio before use on-site, and then injected underground through a static mixer and the main injection line. They have the advantages of being ready to use immediately, accurate metering, and highly automated, and are therefore more widely used.

[0004] However, during the mixing of the anti-swelling agent concentrate with water, there will inevitably be a mixing gap between the blades of a conventional stirrer and the inner wall of the container. Under the action of centrifugal force, the fluid in the edge area is difficult to be effectively drawn into the mainstream area, forming a mixing dead zone, resulting in uneven local agent concentration and affecting the homogenization effect. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a homogenization and continuous injection device for anti-swelling agents. This device solves the problem that during the process of mixing and diluting the concentrated anti-swelling agent solution with water, there is an unavoidable mixing gap between the blades of a conventional stirrer and the inner wall of the container. Under the action of centrifugal force, the fluid in the edge area is difficult to be effectively drawn into the mainstream area, forming a mixing dead zone, which leads to uneven local agent concentration and affects the homogenization effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a device for homogenizing and continuously injecting an anti-swelling agent, comprising: The tee pipe includes a vertical pipe section and a horizontal pipe section intersecting with it, the horizontal pipe section being connected in series in the main water injection line; The mixing unit is located in a vertical pipe section and includes an inner shell. The inner shell contains at least two sets of mixing chambers. The mixing chambers are arranged axially along the vertical pipe section. Each mixing chamber has a concentric inner liner fixed inside it. Each mixing chamber has a feed inlet extending to the bottom of the corresponding inner liner at its upper center. An annular cavity is formed between the outer wall of the inner liner and the inner wall of the mixing chamber. Multiple overflow ports are evenly opened circumferentially at the upper end of the side wall of the inner liner. Between adjacent mixing chambers, the annular cavity of the upper mixing chamber is connected to the inner liner in the lower mixing chamber through the feed inlet of the lower mixing chamber. The mixing unit also includes a stirring assembly, which is located inside the inner tank; The diameter of the lower end pipe section of the feed inlet first contracts and then expands from top to bottom, and the diameter of the expansion section located below the contraction section is smaller than the diameter of the expansion section located above the contraction section. The pipe wall of the contraction section is also uniformly perforated with through holes along the circumference.

[0007] Furthermore, the upper end of the inner shell is fixedly connected to a liquid inlet chamber one for introducing clean water into it, and the upper end of the liquid inlet chamber one is fixedly connected to a liquid inlet chamber two for introducing anti-swelling agent solution into it.

[0008] Furthermore, the stirring assembly includes a stirring shaft rotatably disposed in the inner shell, stirring blades corresponding to the inner liner are uniformly fixedly connected to the stirring shaft, a drive motor for driving the stirring shaft to rotate is fixedly connected to the upper end of the vertical pipe section, and the stirring shaft is rotatably and sealedly connected to the liquid inlet chamber.

[0009] Furthermore, at least two ring plates are fixedly connected between the outer wall of the inner liner and the inner wall of the mixing chamber. Each ring plate has a guide hole that is uniformly opened in the circumferential direction, and the guide holes on adjacent ring plates are staggered.

[0010] Furthermore, it also includes an opening and closing unit located at the intersection of the vertical and horizontal pipe sections, including a valve assembly in the vertical pipe section and a flow sensing assembly in the horizontal pipe section. When the machine stops, the flow sensing assembly is activated by the impact force of the backflowing water, thereby driving the valve assembly to close in advance.

[0011] Furthermore, the valve assembly includes a one-way valve communicating with the lowest mixing chamber. The lower end of the one-way valve is provided with a sealing plate fixedly connected to it and a rotating plate rotatably connected to it. The sealing plate and the rotating plate are rotatably and sealingly connected, and both of them are uniformly and circumferentially provided with corresponding through grooves.

[0012] Furthermore, the one-way valve stem adopts a telescopic design, with its lower end extending through the sealing plate and the rotating plate into the vertical pipe section. The outer peripheral wall of the valve stem is uniformly provided with inclined grooves along the circumference, and the inner peripheral wall of the rotating plate is fixedly connected with a guide post that is slidably disposed in the inclined groove.

[0013] Furthermore, the flow sensing component includes impellers rotatably disposed in the horizontal pipe section and symmetrically arranged on both sides of the vertical pipe section. A drive shaft is fixedly connected between the two impellers. A conical plug is slidably connected to the drive shaft through two symmetrically arranged threaded grooves. Limiting blocks for limiting the rotation stroke of the impellers are fixedly connected to the outer edge of the impellers and the inner peripheral wall of the horizontal pipe section, respectively.

[0014] Furthermore, the drive shaft and the valve stem are connected by a bevel gear set, the outer side of which is provided with a protective shell, and the valve stem and the corresponding bevel gear in the bevel gear set are locked in one direction by a ratchet and pawl.

[0015] Furthermore, the inner peripheral wall of the horizontal pipe section is provided with a tapered section adapted to the tapered plug, and the tapered plug is slidably connected to the inner peripheral wall of the horizontal pipe section through a limiting piece fixedly provided thereon.

[0016] The present invention has the following beneficial effects: (1) The anti-swelling agent homogenization and continuous injection device divides the mixing unit into multiple mixing chambers along the axial direction, and sets an inner liner and an annular cavity in each mixing chamber. With the overflow port opened circumferentially at the upper end of the inner liner, the liquid that is not fully stirred near the edge of the inner liner is preferentially entered into the central area of ​​the next mixing chamber through the overflow port and the annular cavity to be stirred again. Through the step-by-step forced flow path of "edge in, center out", it helps to reduce the influence of the stirring dead zone in the traditional single-cavity stirring, thereby improving the mixing uniformity of the anti-swelling agent and water.

[0017] (2) The homogenization and continuous injection device for the anti-swelling agent has a Venturi tube structure at the lower end of the inlet. The tube wall of the contraction section has through holes. When the mixed liquid passes through the contraction section, it forms a jet effect that impacts the bottom of the inner tank, causing the suspended matter to diffuse. At the same time, some liquid is drawn into the inlet through the through holes under the action of pressure difference to form a circulating vortex, which effectively prevents the agent suspension from depositing at the bottom of the inner tank. The design of the multi-stage mixing chamber reduces the spatial volume of each stage cavity, limits the diffusion range of the suspended matter, and further improves the mixing efficiency.

[0018] (3) The opening and closing unit of the anti-swelling agent homogenization and continuous injection device is driven by impeller flow sensing. When backflow occurs during shutdown, the impact force of the backflow water force forces the impeller to rotate in the opposite direction. The one-way valve is driven to rotate and close in advance through the bevel gear group and ratchet pawl mechanism, cutting off the channel for backflow water to enter the mixing vertical pipe section. This closing action arrives before the backflow water, avoiding the entry of impurities such as mud and clay carried in the backflow water into the valve core sealing surface, preventing impurity accumulation and sealing surface wear, and ensuring long-term reliable opening and closing of the valve.

[0019] (4) When backflow occurs, the impeller rotates in the opposite direction and drives two conical plugs to move in opposite directions along the axial direction through the threaded groove on the drive shaft, thereby increasing the flow area between the conical plugs and the conical section in the horizontal pipe section, thereby reducing the flow velocity and impact pressure of the backflow water, effectively reducing the water hammer effect, and protecting the upstream equipment and pipeline from damage.

[0020] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the structure of the three-way pipe, the dispensing unit, and the opening and closing unit of the present invention; Figure 3 This is a schematic diagram of the overall planar cross-sectional structure of the present invention; Figure 4 For the present invention Figure 3 A magnified structural diagram of part A in the middle; Figure 5 This is a schematic diagram of the mixing unit, liquid inlet chamber one, and liquid inlet chamber two of the present invention; Figure 6 This is a schematic diagram of the dispensing unit of the present invention; Figure 7 This is a schematic diagram of the opening and closing unit of the present invention; Figure 8 For the present invention Figure 7 Schematic diagram of the structure at point B; Figure 9 This is a schematic diagram of the detachable structure of the valve assembly of the present invention; Figure 10 This is a schematic diagram of the structure of the three-way pipe and the opening / closing unit of the present invention.

[0022] In the diagram, 1 is a tee pipe; 11 is a vertical pipe section; and 12 is a horizontal pipe section. 2. Mixing unit; 21. Inner shell; 211. Feed inlet; 2111. Through hole; 22. Inner liner; 221. Overflow port; 23. Annular cavity; 24. Stirring assembly; 241. Stirring shaft; 242. Stirring blades; 243. Drive motor; 25. Ring plate; 251. Guide hole; 3. Opening and closing unit; 31. Valve assembly; 311. Check valve; 312. Sealing plate; 313. Rotating plate; 314. Through groove; 315. Valve stem; 3151. Inclined groove; 316. Guide post; 32. Flow sensing assembly; 321. Impeller; 322. Drive shaft; 3221. Threaded groove; 323. Conical plug; 324. Limiting block; 325. Bevel gear set; 326. Limiting plate; 4. Liquid inlet chamber one; 5. Liquid inlet chamber two. Detailed Implementation

[0023] 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.

[0024] In the description of this invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "around", etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0025] The following is based on Figures 1-10 This invention describes a device for homogenizing and continuously injecting an anti-swelling agent according to an embodiment of the present invention.

[0026] Please see Figures 1-4 This invention provides a technical solution: a device for homogenizing and continuously injecting an anti-swelling agent, comprising: T-pipe 1, which includes a vertical pipe section 11 and a horizontal pipe section 12 intersecting with it, the horizontal pipe section 12 being connected in series in the main water injection line; The mixing unit 2 is located in the vertical pipe section 11 and includes an inner shell 21. The inner shell 21 is provided with at least two sets of mixing chambers. The mixing chambers are arranged along the axial direction of the vertical pipe section 11. Each mixing chamber is fixed with an inner liner 22 concentric with it. The upper center of each mixing chamber is provided with a feed port 211 extending to the bottom of the corresponding inner liner 22. The outer wall of the inner liner 22 and the inner wall of the mixing chamber it is located form an annular cavity 23. The upper side wall of the inner liner 22 is evenly provided with multiple overflow ports 221 along the circumference. Between adjacent mixing chambers, the annular cavity 23 of the upper mixing chamber is connected to the inner liner 22 in the lower mixing chamber through the feed port 211 of the lower mixing chamber. The diameter of the lower end pipe section of the feed inlet 211 first contracts and then expands from top to bottom, and the diameter of the expansion section located below the contraction section is smaller than the diameter of the expansion section located above the contraction section. The pipe wall of the contraction section is also uniformly provided with through holes 2111 along the circumference.

[0027] The upper end of the inner shell 21 is fixedly connected to a liquid inlet chamber 4 for introducing clean water into it, and the upper end of the liquid inlet chamber 4 is fixedly connected to a liquid inlet chamber 5 for introducing anti-swelling agent solution into it.

[0028] The mixing unit 2 also includes a stirring assembly 24, which is located inside the inner liner 22. The stirring assembly 24 includes a stirring shaft 241 rotatably disposed in the inner shell 21. Stirring blades 242 corresponding to the inner liner 22 are uniformly fixedly connected on the stirring shaft 241. A drive motor 243 for driving the stirring shaft 241 to rotate is fixedly connected to the upper end of the vertical pipe section 11. The stirring shaft 241 is rotatably and sealedly connected to the liquid inlet chamber 4.

[0029] See Figure 2 and Figure 3 The anti-swelling agent homogenization and continuous injection device also includes an opening and closing unit 3, which is located at the intersection of the vertical pipe section 11 and the horizontal pipe section 12. It includes a valve assembly 31 in the vertical pipe section 11 and a flow sensing assembly 32 in the horizontal pipe section 12. When the machine stops, the flow sensing assembly 32 is operated by the impact force of the backflow water, thereby driving the valve assembly 31 to close in advance.

[0030] At least two ring plates 25 are fixedly connected between the outer wall of the inner liner 22 and the inner wall of the mixing chamber. Each ring plate 25 has a guide hole 251 evenly opened in the circumferential direction, and the guide holes 251 on adjacent ring plates 25 are staggered.

[0031] See Figures 2-5 During operation, inlet chamber 4 and inlet chamber 5 are connected in series with external metering pumps. The metering pumps continuously supply clean water to inlet chamber 4 and anti-swelling agent solution to inlet chamber 5. The two solutions converge in inlet chamber 4 and enter the inner liner 22 of the uppermost mixing chamber through inlet 211. As the liquid supply continues, the liquid level in the inner liner 22 gradually rises. The stirring shaft 241 rotates under the drive of the drive motor 243, which in turn drives the stirring blades 242 to continuously stir the mixture in the inner liner 22.

[0032] Because the stirring range of the stirring blades 242 is limited, the mixture near the edge of the inner tank 22 may not be fully stirred. As the liquid level rises, the mixture located at the edge of the inner tank 22 overflows into the annular cavity 23 through the overflow port 221 and passes through the guide hole 251 on the ring plate 25, and enters the inner tank 22 of the next mixing chamber through the feed port 211. Since the feed port 211 is located at the center of the mixing chamber, the liquid in the edge area of ​​the previous mixing chamber that was not fully stirred will be stirred in the central area of ​​the next mixing chamber. Through the step-by-step repeated action of the multi-stage mixing chambers, it helps to reduce the stirring dead zone and improve the mixing uniformity.

[0033] As the mixture passes through the inner ring plate 25 of the annular cavity 23, the flow path of the liquid is extended due to the staggered arrangement of the guide holes 251 on the adjacent ring plates 25. The liquid is then split and merged multiple times when passing through each ring plate 25, thereby further promoting the homogenization of the mixture.

[0034] To prevent suspended matter or incompletely dissolved particles from settling at the bottom of the inner tank 22 during the flow of the mixture, the lower end of the inlet 211 is designed with a variable diameter, utilizing the structural principle of a Venturi tube and further improved by adding an expansion section below the contraction section. The purpose is to: as the mixture flows from top to bottom through the contraction section of the inlet 211, the flow velocity increases sharply and the pressure decreases. The increased liquid speed is then ejected through the expansion section below the contraction section, creating a jetting effect that impacts and suspends the sediment at the bottom of the inner tank 22. Simultaneously, the negative pressure zone inside the contraction section creates a pressure difference with the mixture in the outer inner tank 22. This pressure difference causes some of the mixture to be drawn into the inlet 211 through the through-holes 2111 on the contraction section wall and then ejected from the expansion section below, creating a circulating vortex. This further disperses suspended matter in the mixture, improving mixing efficiency and homogenization. In addition, dividing the inner shell 21 into multiple mixing chambers along the axial direction effectively reduces the spatial volume of each mixing chamber, limits the diffusion range of suspended matter, and further improves the mixing efficiency.

[0035] After being mixed in multiple stages, the mixture flows out from the bottom mixing chamber and enters the main water injection line in the horizontal pipe section 12 through the valve assembly 31. It merges with the main water flow and is further mixed by the downstream static mixer before being injected underground, thus achieving continuous homogeneous mixing and injection.

[0036] See Figure 3 , Figure 7 and Figure 9 The valve assembly 31 includes a one-way valve 311 that communicates with the lowest mixing chamber. The lower end of the one-way valve 311 is provided with a sealing plate 312 that is fixedly connected to it and a rotating plate 313 that is rotatably connected to it. The sealing plate 312 and the rotating plate 313 are rotatably and sealingly connected, and both of them are provided with corresponding through grooves 314 that are uniformly opened along the circumference.

[0037] The valve stem 315 of the one-way valve 311 adopts a telescopic design, with its lower end extending through the sealing plate 312 and the rotating plate 313 into the vertical pipe section 11. The outer peripheral wall of the valve stem 315 is uniformly provided with inclined grooves 3151 along the circumferential direction, and the inner peripheral wall of the rotating plate 313 is fixedly connected with a guide post 316 that is slidably disposed in the inclined groove 3151.

[0038] See Figure 3 , Figure 7 and Figure 8The flow sensing assembly 32 includes impellers 321 rotatably disposed in the horizontal pipe section 12 and symmetrically arranged on both sides of the vertical pipe section 11. A drive shaft 322 is fixedly connected between the two impellers 321. A conical plug 323 is slidably connected to the drive shaft 322 through two symmetrically arranged threaded grooves 3221. Limiting blocks 324 for limiting the rotation stroke of the impellers 321 are fixedly connected to the outer edge of the impellers 321 and the inner peripheral wall of the horizontal pipe section 12, respectively.

[0039] The drive shaft 322 and the valve stem 315 are connected by a bevel gear set 325. The outer side of the bevel gear set 325 is provided with a protective shell, and the valve stem 315 and the corresponding bevel gear in the bevel gear set 325 are locked in one direction by a ratchet and pawl.

[0040] The inner peripheral wall of the horizontal pipe section 12 is provided with a tapered section that matches the tapered plug 323. The tapered plug 323 is slidably connected to the inner peripheral wall of the horizontal pipe section 12 through a limiting piece 326 fixedly provided thereon.

[0041] See Figure 3 , Figures 7-10 During operation, the homogenized anti-swelling agent liquid, after multi-stage mixing, flows out from the lowest mixing chamber and, under the action of fluid pressure, pushes the valve core of the one-way valve 311 downward. The fixed section of the valve stem 315 of the one-way valve 311 is fixedly connected to the valve core and moves downward synchronously with the valve core. During the downward movement, the inclined groove 3151 on the outer peripheral wall of the fixed section of the valve stem 315 slides relative to the guide post 316 on the inner peripheral wall of the rotating plate 313. The guiding action of the inclined groove 3151 drives the rotating plate 313 to rotate, so that the through groove 314 on the rotating plate 313 and the through groove 314 on the sealing plate 312 change from a misaligned state to an aligned state, thereby opening the flow channel. The mixed liquid passes through the through groove 314 and flows into the main water injection line in the horizontal pipe section 12. After merging with the main water flow and being further mixed by the downstream static mixer, it is injected underground.

[0042] During the forward water injection process, the main water flow flows from the ground to the ground, and the water flow impact drives the two impellers 321 to rotate synchronously to the water inlet phase. In this phase, the limiting block 324 on the outer edge of the impeller 321 abuts against the front end face of the corresponding limiting block 324 on the inner circumferential wall of the horizontal pipe section 12, limiting the rotation of the impeller 321. At this time, the threaded groove 3221 on the drive shaft 322 keeps the conical plug 323 close to the side of the corresponding impeller 321, and the outer edge of the conical plug 323 maintains a fixed first flow area with the conical section of the inner circumferential wall of the horizontal pipe section 12. At the same time, the ratchet and pawl mechanism is in the release state. When the drive shaft 322 drives the bevel gear set 325 to rotate, the power is not transmitted to the valve stem 315. The valve stem 315 and the rotating plate 313 remain stationary, and the valve assembly 31 remains in the conducting state.

[0043] When the water injection system shuts down and the underground pressure exceeds the pressure inside the pipeline, the injected water in the well carries impurities such as silt and clay from the formation and backflows along the pipeline. The backflowing water impacts the impeller 321 near the downstream side, forcing it to rotate in the opposite direction and switch to the outlet phase. During this reverse rotation: On the one hand, the drive shaft 322 rotates synchronously with the impeller 321, and drives the two conical plugs 323 to move towards each other along the axial direction through the threaded groove 3221, so that the flow area between the outer edge of the conical plug 323 and the conical section of the inner peripheral wall of the horizontal pipe section 12 increases from the first flow area to the second flow area, so as to reduce the impact pressure of the backflow. On the other hand, the drive shaft 322 transmits power to the valve stem 315 through the bevel gear set 325. At this time, the ratchet and pawl mechanism is in the locked state, driving the valve stem 315 to rotate in the opposite direction. When the valve stem 315 rotates in the opposite direction, the cooperation between the inclined groove 3151 and the guide post 316 drives the rotating plate 313 to rotate and reset, so that the through groove 314 on the rotating plate 313 and the through groove 314 on the sealing plate 312 are misaligned again, thereby closing the valve assembly 31 and cutting off the passage for backflow water to enter the regulating vertical pipe section.

[0044] Through the above actions, the valve assembly 31 is closed in advance before the backflow arrives, and the impurities carried by the backflow cannot enter the valve core sealing surface of the one-way valve 311, thus avoiding the accumulation of impurities and wear of the sealing surface. At the same time, the expansion of the flow channel effectively reduces the impact of water hammer, achieving dual protection for the dispensing unit 2 and the valve assembly 31.

[0045] 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.

[0046] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A device for homogenizing and continuously injecting an anti-swelling agent, characterized in that, include: The tee pipe (1) includes a vertical pipe section (11) and a horizontal pipe section (12) intersecting with it, the horizontal pipe section (12) being connected in series in the main water injection line; The mixing unit (2) is located in the vertical pipe section (11) and includes an inner shell (21). The inner shell (21) is provided with at least two sets of mixing chambers. The mixing chambers are arranged along the axial direction of the vertical pipe section (11). Each mixing chamber is fixed with an inner liner (22) concentric with it. The upper center of each mixing chamber is provided with a feed port (211) extending to the bottom of the corresponding inner liner (22). The outer wall of the inner liner (22) and the inner wall of the mixing chamber it is located form an annular cavity (23). The upper side wall of the inner liner (22) is uniformly provided with multiple overflow ports (221) along the circumference. Between adjacent mixing chambers, the annular cavity (23) of the upper mixing chamber is connected to the inner liner (22) in the lower mixing chamber through the feed port (211) of the lower mixing chamber. The mixing unit (2) also includes a stirring assembly (24), which is located inside the inner liner (22); The diameter of the lower end pipe section of the feed inlet (211) first contracts and then expands from top to bottom, and the diameter of the expansion section located below the contraction section is smaller than the diameter of the expansion section located above the contraction section. The pipe wall of the contraction section is also uniformly provided with through holes (2111) along the circumference.

2. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 1, characterized in that, The upper end of the inner shell (21) is fixedly connected to a liquid inlet chamber 1 (4) for introducing clean water into it, and the upper end of the liquid inlet chamber 1 (4) is fixedly connected to a liquid inlet chamber 2 (5) for introducing anti-swelling agent solution into it.

3. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 2, characterized in that, The stirring assembly (24) includes a stirring shaft (241) rotatably disposed in the inner shell (21). Stirring blades (242) corresponding to each inner liner (22) are uniformly fixedly connected on the stirring shaft (241). A drive motor (243) for driving the stirring shaft (241) to rotate is fixedly connected to the upper end of the vertical pipe section (11). The stirring shaft (241) is rotatably and sealedly connected to the liquid inlet chamber (4).

4. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 1, characterized in that, At least two ring plates (25) are fixedly connected between the outer wall of the inner liner (22) and the inner wall of the mixing chamber. Each ring plate (25) has a guide hole (251) evenly opened in the circumferential direction, and the guide holes (251) on adjacent ring plates (25) are staggered.

5. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 1, characterized in that, It also includes an opening and closing unit (3), located at the intersection of the vertical pipe section (11) and the horizontal pipe section (12), including a valve assembly (31) in the vertical pipe section (11) and a flow sensing assembly (32) in the horizontal pipe section (12). When the machine stops, the flow sensing assembly (32) is operated by the impact force of the backflow water, thereby driving the valve assembly (31) to close before the backflow water arrives.

6. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 5, characterized in that, The valve assembly (31) includes a one-way valve (311) communicating with the lowest mixing chamber. The lower end of the one-way valve (311) is provided with a sealing plate (312) fixedly connected thereto and a rotating plate (313) rotatably connected thereto. The sealing plate (312) and the rotating plate (313) are rotatably and sealingly connected, and both are uniformly and circumferentially provided with corresponding through slots (314).

7. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 6, characterized in that, The valve stem (315) of the one-way valve (311) adopts a telescopic design, with its lower end extending through the sealing plate (312) and the rotating plate (313) into the vertical pipe section (11). The outer peripheral wall of the valve stem (315) is uniformly provided with inclined grooves (3151) along the circumferential direction, and the inner peripheral wall of the rotating plate (313) is fixedly connected with a guide post (316) that is slidably disposed in the inclined groove (3151).

8. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 5, characterized in that, The flow sensing assembly (32) includes impellers (321) rotatably disposed in the horizontal pipe section (12) and symmetrically arranged on both sides of the vertical pipe section (11). A drive shaft (322) is fixedly connected between the two impellers (321). A conical plug (323) is slidably connected to the drive shaft (322) through two symmetrically arranged threaded grooves (3221). Limiting blocks (324) for limiting the rotation stroke of the impellers (321) are fixedly connected to the outer edge of the impellers (321) and the inner peripheral wall of the horizontal pipe section (12).

9. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 8, characterized in that, The drive shaft (322) and valve stem (315) are connected by a bevel gear set (325). The outer side of the bevel gear set (325) is provided with a protective shell, and the valve stem (315) and the corresponding bevel gear in the bevel gear set (325) are locked in one direction by a ratchet and pawl.

10. The device for homogenizing and continuously injecting an anti-swelling agent according to claim 9, characterized in that, The inner circumferential wall of the horizontal pipe section (12) is provided with a conical section that matches the conical plug (323). The conical plug (323) is slidably connected to the inner circumferential wall of the horizontal pipe section (12) through a limiting piece (326) fixedly provided thereon.

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