A hydraulic cavitation component for a groundwater circulation well

Abstract

The present invention relates to a hydraulic cavitation assembly for a groundwater circulation well, which is used to form directional tail flow cavitation bubbles to remove dirt that is blocked on the screen pipe of the circulation well. The hydraulic cavitation assembly is installed in the screen pipe section of the circulation well body. The hydraulic cavitation assembly includes a screen pipe section elastic plate, a wedge pad and a screen pipe section cavitation tube. Several screen pipe section elastic plates are overlapped end to end and arranged in a circular array, and a wedge pad is accommodated between the end and tail of two adjacent screen pipe section elastic plates. The wedge pad is installed on the base of the hydraulic cavitation assembly and is located at the tail end of the screen pipe section elastic plate. It engages with the screen pipe section elastic plate to cause it to bend and deform. The screen pipe section cavitation tube is arranged on the screen pipe section elastic plate and turns as the screen pipe section elastic plate deforms.

Description

[0001] Description of the case

[0002] The original basis of this divisional application is the patent application with application number 202210566807.6, application date May 23, 2022, and invention name “A groundwater circulation well system”. Technical Field

[0003] The invention relates to the technical field of in-situ remediation of groundwater pollution, and in particular to a hydraulic cavitation component for a groundwater circulation well. Background Art

[0004] A groundwater circulation well is an in-situ remediation technology that can remove pollutants from groundwater and saturated soil. This technology is a well-in-well model formed by a double-layer casing and an upper and lower sieve pipe combination. It combines extraction and treatment technology with in-situ treatment technology. Water from the aquifer can be introduced into the well through the lower sieve pipe, and then injected into the aquifer from the upper sieve pipe without bringing it out of the ground. At the same time, the groundwater is repeatedly circulated around the circulation well, and the volatile pollutants in the groundwater are continuously separated into gas and liquid and extracted to the ground for treatment, or discharged into the aeration zone through the upper sieve pipe and degraded through in situ bioremediation until the pollutants are fully removed.

[0005] Groundwater circulation well technology divides the well into different screen sections and changes the water pressure distribution between the sections by pumping water or aeration between the different screen sections, thereby driving water flow from the high-pressure screen section to the low-pressure screen section. The three-dimensional vertical circulating water flow formed around the groundwater circulation well draws contaminated groundwater from the surrounding aquifer into the circulation well, where pollutants are removed through stripping and degradation. Groundwater circulation well technology has the advantages of minimal formation disturbance, small footprint, and simple operation. Therefore, it has broad application prospects in groundwater remediation at contaminated sites.

[0006] Existing circulation well technology has several drawbacks. For example, during well construction, it can easily damage the pores in the aquifer surrounding the well, leading to the release of mud from the pores. Repeated erosion by the circulating water can easily cause the release of mud components from the aquifer. The nature of groundwater contaminants is unclear and their distribution is uneven, making them susceptible to being blocked during entry and exit of the screen and deposited in areas of the screen where flow velocity is locally slowed. Furthermore, enhanced degradation methods, such as chemical or biological, used during remediation alter the chemical and biological composition of groundwater, making it prone to forming chemical and biological stains such as inorganic salt scale, organic oil films, and biofilms on unclean or rough screen surfaces. These physical, chemical, and biological stains accumulate over time, clogging the screen mesh or key components of the circulation well, such as the aeration head, thereby blocking groundwater inflow and outflow, reducing the radius of the well's three-dimensional circulation flow, and even leading to the complete loss of the well's circulation function and its decommissioning if the screen is severely clogged. These drawbacks have severely impacted the application and development of groundwater circulation well technology.

[0007] Prior art, such as Chinese patent document CN214763784U, discloses a high-efficiency filter screen for use in groundwater circulation wells, comprising a housing, the inner surface of which is fixedly connected to a reset mechanism, the top and bottom of which are respectively fixedly mounted with an upper filter mechanism and a lower filter mechanism, the upper filter mechanism comprising an upper frame, the interior of which is fixedly mounted an upper filter screen, the lower filter mechanism comprising a lower frame, the interior of which is fixedly mounted a lower filter screen, and the interior of the housing is fixedly mounted with a vibration mechanism, wherein the vibration mechanism is arranged inside the housing, and the vibration mechanism is driven to vibrate the filter mechanism, thereby vibrating and filtering the groundwater to reduce impurities contained in the groundwater, and the reset mechanism is arranged to drive the filter mechanism to reset, and cooperate with the vibration mechanism to cause the filter mechanism to vibrate back and forth, thereby preventing the accumulation of impurities filtered from the groundwater from clogging the filter screen, thereby improving the filtering effect of the filter mechanism on the groundwater. However, this device filters coarse impurities through vibration, and does not consider the scaling and clogging of fine particles or chemical and biological components. This device is only suitable for the preliminary filtration of groundwater, has low anti-clogging ability, and has poor filtering effect on contaminated groundwater containing a large amount of chemical and biological components.

[0008] Chinese patent publication number CN112682521A discloses an erosion-resistant multi-stage pressure-reducing angle valve trim, comprising a valve body and an upper cover, the valve body and the upper cover being connected by studs. The valve body is provided with a valve core, a valve seat, a sleeve, a first anti-scour pipe, a second anti-scour pipe, and a third anti-scour pipe. The upper end of the second anti-scour pipe is positioned and connected to the upper cover by an anti-rotation flat key. The second anti-scour pipe is connected to the first anti-scour pipe using an inlay process. The first anti-scour pipe is connected to the valve body by an interference fit and is mounted to the pipe flange by clamping. The valve core adopts an axial flow multi-stage pressure-reducing structure, and the valve core and valve stem are connected by a sheathing method. This invention avoids cavitation through axial flow multi-stage pressure reduction, thus avoiding the risk of cavitation damage to valve components. However, this invention also loses the advantages of cavitation in enhancing water quality activity and preventing valve components from scaling, clogging, and scrapping.

[0009] Chinese patent publication CN102417233A discloses a hydraulic cavitation aerator, a device for efficiently aerating and oxygenating water during biochemical treatment of sewage, while simultaneously utilizing the generated hydraulic cavitation effect to directly degrade organic pollutants in the water. The hydraulic cavitation aerator comprises a motor and a drive shaft, an upper end cover, a spiral stirring impeller, a conical multi-porous baffle, and an aeration cylinder. The motor is mounted on the upper end cover, the motor shaft extending through an axial hole in the upper end cover and connected to the upper end of the drive shaft, and the lower end of the drive shaft is connected to the spiral stirring impeller. The motor is mounted on the upper end cover of the aeration cylinder, with the drive shaft and spiral stirring impeller positioned within the inner cavity of the aeration cylinder. The conical multi-porous baffle is positioned at the lower portion of the inner cavity of the aeration cylinder and below the spiral stirring impeller. This device uses the entire aeration cylinder for aeration. While this can reduce dead zones, the aeration is too uniform, lacking specificity in the aeration of the baffle's tapered holes. Consequently, the air content in the water within these holes cannot be rapidly increased to a high level. The device also lacks adjustable cavitation jet direction.

[0010] In summary, while existing circulating well systems use vibration to filter coarse particle impurities to prevent clogging of the circulating well screen, they do not consider the scaling and clogging of fine particle components or chemical and biological components. While existing circulating well systems use the hydraulic cavitation effect to prevent clogging of the circulating well screen, the direction of the cavitation jet cannot be adjusted, limiting the decontamination efficiency.

[0011] The hydraulic cavitation component provided by the present invention can release high-energy shock waves and microjets to forcefully remove dirt clogged on the circulating well screen tube, and can prevent the deposition of impurities of different sizes and reagents of different concentrations on the screen tube; it can enhance the activity of groundwater, thereby improving the groundwater's ability to dissolve scaling substances; it can clean the screen tube surface, induce vibrations of different frequencies, and reduce the ability of scaling substances to adhere to and scale the screen tube surface, thereby effectively reducing the risk of screen tube blockage.

[0012] In addition, on the one hand, there are differences in understanding among those skilled in the art; on the other hand, the inventor studied a large number of documents and patents when making the present invention, but due to space limitations, not all details and contents are listed in detail. However, this does not mean that the present invention does not have the characteristics of these prior arts. On the contrary, the present invention already has all the characteristics of the prior art, and the applicant reserves the right to add relevant prior art to the background art. Summary of the Invention

[0013] In view of the deficiencies of the prior art, the present invention provides a groundwater circulation well system, aiming to solve at least one or more technical problems existing in the prior art.

[0014] In the existing in-situ repair of circulating wells, the anti-clogging measures for the circulating well screen include adding a high-efficiency vibrating filter screen or injecting a descaling agent outside the circulating well, which can directly or indirectly reduce the blockage caused by coarse-grained impurities in groundwater or high-concentration agents passing through the circulating well screen. However, these measures ignore the blockage risk caused by fine-grained impurities, low-concentration agents, or scaling precipitation of elements such as iron and manganese caused by changes in the redox conditions of groundwater. These fine-grained impurities or low-concentration agents are suspended in groundwater for a long time and pass through the screen repeatedly, which poses a greater risk of blockage. Therefore, the present invention applies for a groundwater circulating well system that couples hydraulic cavitation and circulating well technology to reduce the risk of screen blockage in in-situ repair of circulating wells, thereby achieving the purpose of maintaining the normal operation of the groundwater circulation function and improving the practicality of the circulating well technology.

[0015] The hydraulic cavitation assembly of the present invention can be installed separately in the upper and lower screen sections of a circulation well. The assembly includes a cavitation tube with a variable diameter structure and rotating blades at the water inlet end. Driven by the high pressure differential within the circulation well, groundwater enters the cavitation tube with a variable diameter, driving the rotating blades to rotate at high speed, forming an inlet vortex, which causes a local pressure drop within the cavitation tube. This causes the groundwater flowing through the cavitation tube and the solid-liquid interface where the groundwater contacts the inner wall of the cavitation tube to undergo a process of cavitation bubble formation, development, and collapse. When the cavitation bubbles in the cavitation tube collapse, they generate instantaneous local high temperature and high pressure, forming a strong cavitation shock wave and microjets, with the microjets reaching a speed of 400 km / h. If a cavitation bubble collapses on the surface of the sieve tube corresponding to the cavitation tube, high-energy shock waves and microjets will form a high-pressure area on the sieve tube surface. The collapse point of a single cavitation bubble on the sieve tube surface is small. Therefore, the huge energy released by the cavitation bubble is concentrated on many very small area units on the sieve tube surface. Dirt composed of fine particles of impurities is deposited in these area units. The strong erosion caused by the collapse of the cavitation bubble can destroy the dirt in the sieve tube. At the same time, the cavitation bubble generates vibrations of different frequencies during the compression and release process. These vibrations are transmitted through groundwater to the sieve tube and dirt surface with different natural frequencies, stimulating the sieve tube and dirt to vibrate at different frequencies, thereby destroying the bonding force between the sieve tube and the dirt, causing the dirt on the sieve tube to loosen. In particular, due to the large frequency fluctuations caused by the cavitation process of the present invention, compared with traditional vibration filtration measures, the present invention significantly improves the efficiency of removing dirt with different natural vibration frequencies on different parts of the sieve tube.

[0016] In addition, the present invention supplies air to the aeration port corresponding to the water inlet end of the cavitation tube through an aeration pump, so that a large number of ions accumulate at the gas-liquid interface of the cavitation bubble in the cavitation tube. These ions can generate local high-concentration strong oxidizing free radicals in the cavitation tube, promoting the decomposition of water molecules in the groundwater into active substances such as H· and HO·. These active substances can increase the activity of the groundwater and enhance the solubility of the groundwater, thereby improving the scale-dissolving ability of the groundwater, so as to clean the surface of the sieve tube, making it difficult for dirt to be deposited on the surface of the sieve tube to become hard scale. It can also promote the release of microcrystalline nuclei of the scaling substances and gradually dissolve the scaling substances. When the cavitation bubble bursts on the surface of the sieve tube, the gas in the cavitation bubble absorbs heat and has a high temperature, which is difficult to cool down through water-gas heat exchange in a short time. Therefore, these hot air flows bake the scaling substances, thereby accelerating the disintegration and dissolution of the scale on the surface of the sieve tube.

[0017] The circulation well body of the present invention is composed of a plurality of screen pipe sections and solid pipe sections separated from each other in the axial direction. The circulation well with a double-screen structure is composed of an upper screen pipe section and a lower screen pipe section, wherein the contaminated groundwater to be purified enters the lower screen pipe section from outside the lower screen pipe section through the screen pipe of the lower screen pipe section based on the external and internal pressure difference, and the groundwater entering the lower screen pipe section is pumped into the upper screen pipe section by the pumping and injection switching component of the circulation well body, wherein the groundwater to be purified accumulated in the upper screen pipe section passes through the screen pipe of the upper screen pipe section based on the internal and external pressure difference and enters the water-bearing stratum outside the upper screen pipe section, and there is also a variable-direction hydraulic cavitation component capable of forming tail flow cavitation bubbles in the upper screen pipe section and / or the lower screen pipe section. The hydraulic cavitation component is arranged circumferentially at the corresponding screen pipe position so that a cavitation bubble liquid flow containing dirt for removing the respective screen pipes is formed at the water inlet front end of the corresponding screen pipe with the help of the flow of the groundwater to be purified.

[0018] According to a preferred embodiment, the cavitation bubbles in the wake flow include at least a component different from the radial direction when emitted from the circumferentially distributed hydrodynamic cavitation components, so that the wake flow includes at least a circumferential component of liquid flow when impacting the corresponding screen tube in the radial direction.

[0019] According to a preferred embodiment, the circumferential component in the wake flow can be adjusted by changing the orientation of the cavitation tube of the hydrodynamic cavitation assembly.

[0020] According to a preferred embodiment, the first hydraulic cavitation component is located within the upper screen tube section, and the first hydraulic cavitation component has a plurality of cavitation tubes arranged along the circumferential inner wall. Aeration pipes are provided at the water inlet front ends of these cavitation tubes to supply air, so as to increase the gas nucleus content in the groundwater at the water inlet front ends of each cavitation tube to promote the formation of cavitation bubbles.

[0021] According to a preferred embodiment, the second hydraulic cavitation component is located outside the lower screen tube section, and the second hydraulic cavitation component has a plurality of cavitation tubes distributed along the circumferential inner wall. The front end of the water inlet of these cavitation tubes is provided with an aeration pipe for air supply, so as to increase the gas nucleus content in the groundwater at the front end of the water inlet of each cavitation tube to promote the formation of cavitation bubbles.

[0022] According to a preferred embodiment, the hydrodynamic cavitation assembly is provided with rotating blades at the water inlet front ends of the corresponding cavitation tubes. The rotating blades can rotate so that the water flow entering the cavitation tube is a vortex, thereby increasing the area of ​​the low pressure zone at the water inlet front ends of the cavitation tubes to promote the formation of cavitation bubbles.

[0023] According to a preferred embodiment, the lower screen tube section has a smaller diameter than the upper screen tube section, so that the lower screen tube section has a constricted neck.

[0024] According to a preferred embodiment, by means of the elasticity of the fixed plate supporting each cavitation tube, the flow of the wake can trigger the elastic change of the fixed plate, thereby causing the orientation of the wake to change, so that the circumferential component liquid flow included in the wake when it impacts the corresponding screen tube also changes in time.

[0025] According to a preferred embodiment, the orientations of the cavitation tubes have substantially the same circumferential component, so that the liquid flows out of all the cavitation tubes have substantially the same circumferential liquid flow components in the circumferential direction of the screen tube, and thus the circumferential component liquid flows when the wake impacts the corresponding screen tube form a consistent flow direction in the entire circumferential direction of the screen tube.

[0026] According to a preferred embodiment, the orientations of the cavitation tubes can be adjusted jointly, and in particular, the orientations of the cavitation tubes arranged in a row in the axial direction can be adjusted by a common adjustment mechanism.

[0027] The advantages of the present invention are that the hydraulic cavitation component of the present invention can release high-energy shock waves and microjets to strongly remove dirt blocked on the circulation well screen, and can prevent the deposition of impurities of different sizes and reagents of different concentrations on the screen; can enhance the activity of groundwater, thereby improving the groundwater's ability to dissolve scaling substances; can clean the screen surface, induce vibrations of different frequencies and reduce the ability of scaling substances to adhere to the screen surface, thereby effectively reducing the risk of screen blockage. The present invention can solve the problem that the existing groundwater circulation well technology can only prevent the blockage of coarse particles and high-concentration reagents in groundwater by coupling the hydraulic cavitation component with the circulation well. The present invention greatly improves the anti-blocking ability of the groundwater circulation well through the hydraulic cavitation component, and improves the repair ability of the groundwater circulation well technology, can prevent the precipitation and blockage of impurities of different sizes and reagents of different concentrations, thereby effectively repairing groundwater pollutants while significantly reducing the blockage problem of the well body, and making the circulation well provided by the present invention more widely applicable. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a simplified structural diagram of a circulation well system according to a preferred embodiment of the present invention;

[0029] Figure 2 This is a simplified three-dimensional schematic diagram of a circulation well system according to a preferred embodiment of the present invention;

[0030] Figure 3 is a simplified three-dimensional schematic diagram of the hydrodynamic cavitation assembly of the present invention;

[0031] Figure 4 It is a three-dimensional schematic cross-sectional view of the hydrodynamic cavitation component of the present invention.

[0032] Reference Signs List

[0033] 1: Lower screen section tie rod; 2: Upper screen section tie rod; 3: Ground processing station; 4: Aeration pump; 5: Air collection pump; 6: Pumping and injection pump; 7: Air collection hood; 8: Upper screen section air injection pipe; 9: Wire trough; 10: Upper screen section; 11: Upper screen section elastic plate; 12: Automatic pumping and injection switching assembly; 13: Upper screen section cavitation tube; 14: Upper screen; 15: Upper screen section rotating blade; 16: Packer; 17: Upper screen section aeration Inlet; 18: Annular aeration pipe; 19: Lower screen pipe protection tube; 20: Lower screen pipe section; 21: Lower screen pipe section air injection pipe; 22: Lower screen pipe section aeration port; 23: Lower screen pipe section rotating blade; 24: Lower screen pipe section elastic plate; 25: Lower screen pipe section cavitation pipe; 26: Lower screen pipe; 27: Hydraulic cavitation assembly base; 28: Wedge pad; 29a: First hydraulic cavitation assembly; 29b: Second hydraulic cavitation assembly; 30: Circulation well body. DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to the accompanying drawings.

[0035] The present invention relates to a hydraulic cavitation groundwater circulation well system, comprising a circulation well body 30. The circulation well body 30 is composed of an upper screen pipe section 10 and a lower screen pipe section 20, which are separated from each other in the axial direction. Groundwater to be purified enters the lower screen pipe section 20 from outside the lower screen pipe section 20 through the screen pipe of the lower screen pipe section 20 due to the external-internal pressure differential. The groundwater entering the lower screen pipe section 20 is then pumped into the upper screen pipe section 10 by a pumping and injection switching assembly of the circulation well body 30. Groundwater to be purified accumulated in the upper screen pipe section 10 then passes through the screen pipe of the upper screen pipe section 10 due to the internal-internal pressure differential and enters the water-bearing stratum outside the upper screen pipe section 10.

[0036] The present invention also includes variable-direction hydraulic cavitation components 29a, 29b in the upper screen pipe section 10 and / or the lower screen pipe section 20, which can form wake cavitation bubbles. These components are arranged circumferentially at the corresponding screen pipe positions so that, with the help of the flow of groundwater to be purified, a liquid flow containing cavitation bubbles for removing dirt from the respective screen pipes is formed at the front end of the water inlet of the corresponding screen pipe.

[0037] The hydrodynamic cavitation components 29a, 29b form tail flow cavitation bubbles in the groundwater flow to be purified in the following manner: the groundwater flow, driven by the hydrodynamic cavitation components 29a, 29b, passes through a cavitation tube whose diameter changes in the flow direction and thereby forms cavitation bubbles in the tail flow of the hydrodynamic cavitation components 29a, 29b.

[0038] according to Figure 1The circulation wellbore 30 may include an upper screen 14, a lower screen 26, and a packer 16. The packer 16 divides the circulation wellbore 30 into an upper screen section 10 and a lower screen section 20. The walls of the upper and lower screens 14 and 26 are filled with quartz sand, creating a filterable connection between the inside and outside of the pipes. The upper and lower screens 14 and 26 allow water to circulate within the wellbore wall.

[0039] according to Figure 1 The pumping and injection water switching assembly of the present invention is configured as an automatic pumping and injection water switching assembly 12, which includes a horizontal pipe, a first vertical pipe and a second vertical pipe respectively connected to the two sides of the horizontal pipe, and the first vertical pipe is parallel to the second vertical pipe. The first vertical pipe port is located at the lower screen pipe section 20 as the groundwater inlet, and the second vertical pipe port is located at the upper screen pipe section 10 as the groundwater outlet. Preferably, the horizontal pipe is parallel to the packer 16 and is higher than the groundwater level. The pumping and injection water pump 6 for extracting groundwater is installed on the horizontal pipe. The outer wall of the pumping and injection water pump 6 and the circuit inside the pump are not in contact with the groundwater, so as to avoid the groundwater causing a circuit short circuit, thereby interrupting the extraction of groundwater. When the pumping and injection water pump 6 is started, the groundwater in the lower screen pipe section 20 enters the first vertical pipe from the first vertical pipe port, then flows to the horizontal pipe and the second vertical pipe, flows out from the second vertical pipe port, and enters the upper screen pipe section 10.

[0040] In the present invention, the system uses a pumping and injection pump 6 to extract contaminated groundwater from the lower sieve section 20 and inject it into the upper sieve section 10. Once inside the upper sieve section 10, the groundwater first flows through the hydrodynamic cavitation assembly 29a, located on the side of the upper sieve section 10 facing away from the aquifer, before passing through the wall of the upper sieve 14 and entering the aquifer surrounding the circulation well. As the groundwater is pumped away, a negative pressure space forms within the lower sieve section 20. Under pressure, groundwater from the surrounding aquifer enters the lower sieve section 20 through the hydrodynamic cavitation assembly 29b, located on the side of the lower sieve section 20 facing the aquifer. The automatic pumping and injection switching assembly 12 utilizes the pumping and injection pump 6 to pump and inject water between the different sieve sections, creating a groundwater pressure differential between the upper and lower sieve sections 10, thereby forming a three-dimensional vertical circulation flow that drives the groundwater into the well for removal.

[0041] according to Figure 1 The present invention also includes a ground processing station 3, an air collecting pump 5 and an air collecting hood 7. The air collecting pump 5 is installed on the air collecting pipe body, and the umbrella-shaped air collecting hood 7 is installed on one end of the air collecting pipe located in the upper screen pipe section 10 and above the groundwater level. The other end of the air collecting pipe is connected to the ground processing station 3. The ground processing station 3, the air collecting pipe and the air collecting hood 7 are internally connected. When the air collecting pump 5 is started, the waste gas in the circulating well body 30 is collected through the air collecting hood 7 and then input into the ground processing station 3 for centralized treatment of the waste gas. The ground processing station 3 is located on the ground, and the operator controls the groundwater circulation well system in the ground processing station 3. The air collecting hood 7 and the air collecting pump 5 can be arranged in the upper screen pipe section 10 above the groundwater level relative to the water pump 6.

[0042] according to Figure 1 and Figure 4 The present invention further includes a first hydraulic cavitation assembly 29a, a second hydraulic cavitation assembly 29b, and a hydraulic cavitation assembly base 27 that carries the first and second hydraulic cavitation assemblies 29a, 29b, respectively. The first hydraulic cavitation assembly 29a includes an upper screen section elastic plate 11, a wedge-shaped pad 28, and an upper screen section cavitation tube 13. The second hydraulic cavitation assembly 29b includes a lower screen section elastic plate 24, a wedge-shaped pad 28, and a lower screen section cavitation tube 25.

[0043] The first hydraulic cavitation assembly 29a is installed in the upper screen pipe section 10, and the second hydraulic cavitation assembly 29b is installed in the lower screen pipe section 20. Through this installation method, the present invention can reduce the risk of simultaneous blockage of the upper and lower screen pipes, prevent the circulation function from being damaged due to blockage of one or two screen pipe sections, and thus achieve the purpose of maintaining the normal operation of the groundwater circulation function.

[0044] Preferably, if Figure 1 As shown, the first hydraulic cavitation assembly 29a is located within the upper sieve section 10. It comprises multiple cavitation tubes arranged along the circumferential inner wall. These cavitation tubes are supplied with aeration pipes at the water inlet ends to increase the gas nucleus content in the groundwater at the water inlet ends of each cavitation tube, thereby promoting the formation of cavitation bubbles. Within the upper sieve section 10, the aeration pipes for air supply are configured as annular aeration pipes 18.

[0045] Preferably, the elasticity of the fixed plate supporting each cavitation tube is utilized to cause the elasticity of the fixed plate to change during the wake flow, thereby causing the wake flow's orientation to change, resulting in a temporal change in the circumferential component flow included in the wake flow as it impacts the corresponding screen tube. The fixed plate of the present invention can be configured as an elastic plate, and an upper screen tube segment elastic plate 11 and a lower screen tube segment elastic plate 24 are provided depending on the installation position of the fixed plate at the different screen tube segments.

[0046] according to Figure 4The upper screen section elastic plate 11 adopts an arc-shaped structure. The head end of the upper screen section elastic plate 11 is connected to the hydraulic cavitation assembly base 27 through a fastener, and the tail end of the upper screen section elastic plate 11 overlaps the head end of the adjacent upper screen section elastic plate 11. Multiple upper screen section elastic plates 11 are overlapped end to end and evenly arranged in a circular array. A wedge pad 28 can be accommodated between the head and tail of two adjacent upper screen section elastic plates 11. The wedge pad 28 is installed on the hydraulic cavitation assembly base 27 and is located at the tail end of the upper screen section elastic plate 11. It can fit into the upper screen section elastic plate 11 to cause it to bend and deform. The upper screen section cavitation tube 13 includes an inlet end, an outlet end, and a connecting pipe. The inlet end and the outlet end are connected by the connecting pipe, and form a dumbbell-shaped integrated structure with the connecting pipe. This arrangement makes the upper screen section cavitation tube 13 a variable diameter structure. The upper screen section cavitation tube 13 is arranged on the upper screen section elastic plate 11, and can be turned as the elastic plate deforms. Its water inlet end is located on the side where the wedge pad 28 is installed on the hydraulic cavitation component base 27, and its water outlet end is located on the side away from the wedge pad 28.

[0047] Preferably, the hydrodynamic cavitation components 29a and 29b are respectively provided with rotating blades upstream of their corresponding cavitation tubes. The rotating blades can rotate to make the water flow entering the cavitation tube a vortex, thereby increasing the area of ​​the low pressure zone at the front end of the water inlet of the cavitation tube to promote the formation of cavitation bubbles.

[0048] The first hydrodynamic cavitation assembly 29a includes upper sieve section rotating blades 15, and the second hydrodynamic cavitation assembly 29b includes lower sieve section rotating blades 23. The upper sieve section rotating blades 15 are mounted on the outer wall of the water inlet end of the upper sieve section cavitation tube 13, and the outer wall of the upper sieve section cavitation tube 13 and the upper sieve section rotating blades 15 are connected by bearings. A conduit for gas and liquid circulation is provided in the center of the upper sieve section rotating blades 15, and the conduit communicates with the interior of the water inlet end of the upper sieve section cavitation tube 13.

[0049] The second hydrodynamic cavitation assembly 29b has the same structure and installation method as the first hydrodynamic cavitation assembly 29a.

[0050] Preferably, the elastic plate of the present invention is a thin plate made of a material that readily bends under external forces, such as an elastic steel plate or a corrosion-resistant plate made of a material that expands and contracts. Bending deformation of the elastic plate can also be achieved by installing an elastic member on the contact surface between the elastic plate and the wedge-shaped pad 28. The size of the elastic plate can be designed according to actual needs, and the axial and longitudinal spacing between multiple elastic plates can be adjusted to vary the number of elastic plates on the hydrodynamic cavitation assembly base 27, thereby meeting different hydrodynamic cavitation flux requirements.

[0051] Preferably, the wedge-shaped pad 28 of the present invention is a pad with different thicknesses at both ends, wherein one end of the pad is sharp and can be inserted into other objects to provide a cushioning effect. The wedge-shaped pad 28 can be made of alloy, ferrite, or other magnetic materials and can have various shapes, such as rectangle, square, triangle, or other shapes.

[0052] Preferably, the number of cavitation tubes on the elastic plate is not limited to one, but can be multiple. The spacing between multiple cavitation tubes on the same elastic plate can be adjusted to change the number of cavitation tubes. The more cavitation tubes there are, the greater the flux of hydrodynamic cavitation.

[0053] according to Figure 1 and Figure 3 In the upper screen section 10, the hydrodynamic cavitation assembly base 27 is sleeved onto the upper screen 14, with the upper screen section's rotating blades 15 facing away from the aquifer. The outlet ends of the multiple upper screen section's cavitation tubes 13 are eccentrically positioned relative to the upper screen 14, facing the upper screen 14. This eccentric arrangement ensures that the cavitation bubbles in the wake of the present invention, when emitted from the circumferentially distributed hydrodynamic cavitation assemblies 29a and 29b, contain at least a component other than a radial component. Consequently, the wake includes at least a circumferential component of liquid flow when radially impacting the corresponding screen.

[0054] The groundwater in the upper screen pipe section 10 enters the water inlet end of the upper screen pipe section cavitation tube 13 through the conduit of the upper screen pipe section rotating blade 15, and drives the upper screen pipe section rotating blade 15 to rotate at a high speed, thereby forming a water inlet vortex at the water inlet end of the upper screen pipe section cavitation tube 13, increasing the area of ​​the low-pressure area in the upper screen pipe section cavitation tube 13, so that cavitation bubbles are generated inside the upper screen pipe section cavitation tube 13. The cavitation bubbles are ejected from the water outlet end of the upper screen pipe section cavitation tube 13 toward the wall of the upper screen pipe 14 in the form of cavitation shock waves and microjets, so as to achieve the purpose of eroding the screen pipe wall and scaling substances in the pipe.

[0055] according to Figure 1 The water inlet of the upper sieve section cavitation tube 13 is provided with a corresponding upper sieve section aeration port 17. A gap is defined between two adjacent upper sieve section rotating blades 15 to accommodate the upper sieve section aeration port 17. The upper sieve section aeration port 17 is provided on an annular aeration tube 18, which is internally connected to the corresponding upper sieve section air injection pipe 8. The present invention uses the upper sieve section aeration port 17 to quickly replenish the gas nuclei content at the water inlet of the upper sieve section cavitation tube 13, thereby promoting the formation of cavitation bubbles in the upper sieve section cavitation tube 13.

[0056] Preferably, the hydraulic cavitation assemblies 29a and 29b of the present invention, through the coordinated action of the cavitation tubes 13 and 25 of the upper and lower screen sections, the elastic plates 11 and 24 of the upper and lower screen sections, and the wedge pads 28, can change direction within the circulation well body 30, and can also operate in the scale removal and blockage removal phase and the scale prevention and pipe protection phase, and switch between the two phases. The hydraulic cavitation assembly of the present invention can achieve a good balance between scale removal and blockage removal, scale prevention, and screen cavitation protection, thereby improving the practicality of the circulation well technology. In different phases, the wedge pads 28 operate selectively. The hydraulic cavitation assembly increases or decreases the deformation of the elastic plate by adjusting the footage of the wedge pads 28, thereby changing the jet angle and distance of the cavitation tubes in the elastic plate to the screen, and further adjusting the destructive strength of the cavitation bubbles of the hydraulic cavitation assembly against scaling materials and screen erosion. Therefore, the hydraulic cavitation assembly of the present invention has the characteristics of multiple working modes, thereby achieving the purpose of reducing the risk of screen blockage while reducing the cavitation erosion rate of the screen wall, thereby extending the service life of the groundwater circulation well.

[0057] Preferably, the circumferential component of the wake flow of the present invention can be adjusted by changing the orientation of the cavitation tubes of the hydrodynamic cavitation assemblies 29a, 29b, and the hydrodynamic cavitation assemblies 29a, 29b can be switched between the descaling and unblocking stage and the anti-scaling and pipe protection stage by adjusting the circumferential component of the wake flow.

[0058] Preferably, in the upper screen pipe section 10, when the first hydraulic cavitation component 29a is in the descaling and unblocking stage, the wedge pad 28 does not work, the upper screen pipe section elastic plate 11 does not bend and deform, the overlap between the two adjacent upper screen pipe section elastic plates 11 is high in fit and sealing, and the contaminated groundwater enters and exits through the upper screen pipe section cavitation tube 13 that is arranged through the upper screen pipe section elastic plate 11. The change in the diameter of the upper screen pipe section cavitation tube 13 causes a sudden change in the flow rate and pressure of the contaminated groundwater flowing through the upper screen pipe section cavitation tube 13. When the pressure is less than the saturated vapor pressure, hydraulic cavitation occurs. At this time, the first hydraulic cavitation component 29a works at full load and the cavitation efficiency is high. Because the upper sieve section elastic plate 11 is not bent or deformed, the upper sieve section cavitation tube 13 on the upper sieve section elastic plate 11 is perpendicular to the wall of the upper sieve section 14. At this point, the cavitation bubbles generated by the first hydraulic cavitation assembly 29a impact the wall of the upper sieve section 14 at the greatest angle and at the shortest distance from the upper sieve section 14. This maximizes the number of cavitation bubbles that reach the wall of the upper sieve section 14 and burst within it. The cavitation shock wave and microjets are ejected perpendicularly to the upper sieve section 14, directly eroding it. At this point, the first hydraulic cavitation assembly 29a achieves its strongest descaling capability. In the first hydraulic cavitation assembly 29a, contaminated groundwater passes sequentially through the upper sieve section rotating blades 15, the upper sieve section cavitation tube 13, and then flows into the upper sieve section 14. Cavitation bubbles burst on the wall of the upper sieve section 14 and within it, achieving powerful descaling and unblocking.

[0059] Preferably, during the scale prevention and protection phase, the wedge pads 28 are activated, causing the upper screen section elastic plates 11 to bend and deform due to the engagement of the wedge pads 28. Adjacent upper screen section elastic plates 11 separate, weakening the seal and causing the upper screen section cavitation tubes 13 on the upper screen section elastic plates 11 to shift. At this point, the upper screen section cavitation tubes 13 and the upper screen pipe 14 are no longer perpendicular to each other. The angle at which the cavitation bubbles generated by the first hydraulic cavitation assembly 29a impact the wall of the upper screen pipe 14 decreases, and the distance from the upper screen pipe 14 increases. This reduces the number of cavitation bubbles that reach the wall of the upper screen pipe 14 and burst within it, thereby reducing the cavitation damage to the upper screen pipe 14. Furthermore, contaminated groundwater can enter and exit not only through the upper screen section cavitation tubes 13 but also through the gap between the two adjacent upper screen section elastic plates 11, forming a dual inlet and outlet channel. The portion of groundwater that enters and exits through this gap does not undergo hydraulic cavitation, thus reducing its ability to damage the upper screen pipe 14. The wedge-shaped pad 28 changes the deformation of the upper screen pipe section elastic plate 11 and the size of the gap between two adjacent upper screen pipe section elastic plates 11 by changing its own height and slope.

[0060] The height of the wedge pad 28 of the present invention is not fixed, and the height can be self-adjusted during the operation of the wedge pad 28. The height of the wedge pad 28 is proportional to the deformation of the elastic plate, the directional amplitude of the cavitation tube, and the adjustable range of the cavitation shock wave and microjet energy of the screen tube. The higher the height of the wedge pad 28, the greater the deformation of the elastic plate when the full footage is engaged with the elastic plate, the greater the directional amplitude of the cavitation tube fixed to the elastic plate, and the wider the adjustable range of the cavitation shock wave and microjet energy of the screen tube. The slope of the wedge pad 28 of the present invention is not fixed, and the slope can be self-adjusted during the operation of the wedge pad 28. The slope of the wedge pad 28 is proportional to the deformation of the elastic plate and the directional amplitude of the cavitation tube, and inversely proportional to the adjustment accuracy of the cavitation shock wave and microjet energy of the screen tube. The smaller the slope of the wedge-shaped pad 28 is, the smaller the deformation of the elastic plate is under the same penetration footage of the wedge-shaped pad 28, the smaller the change in direction of the cavitation tube fixed on the elastic plate is, and the higher the accuracy of regulating the cavitation shock wave and micro-jet energy on the screen pipe. Preferably, the slope of the wedge-shaped pad 28 is a straight angle or an acute angle less than 60°, so that it can penetrate the elastic plate more accurately and continuously, thereby accurately and continuously changing the direction of the cavitation tube, and realizing a gradual transition from cavitation for the purpose of descaling and unblocking to cavitation for the purpose of preventing scaling and protecting the screen pipe.

[0061] Preferably, the orientations of the cavitation tubes of the present invention can be adjusted jointly, and in particular, the orientations of the cavitation tubes arranged in a row in the axial direction can be adjusted by a common adjustment mechanism.

[0062] according to Figure 1 、 Figure 2 and Figure 3The present invention also includes multiple tie rods, including an upper screen section tie rod 2 and a lower screen section tie rod 1. Wedge pads 28 are connected to the side surfaces of the tie rods. Wedge pads 28 arranged vertically in the same row form a group, and each group of wedge pads 28 is connected to the same vertical tie rod. The tie rods drive a group of wedge pads 28 to rise and fall synchronously, and different groups of tie rods can be connected and raised synchronously. The vertical lifting tie rods can drive a group of wedge pads 28 to engage the elastic plate, continuously changing the feed rate. Therefore, with the synchronous lifting of the tie rods, the orientation of each cavitation tube of the present invention has approximately the same circumferential component, ensuring that the liquid flow exiting all cavitation tubes has approximately the same circumferential liquid flow component along the circumference of the screen tube. Consequently, the circumferential liquid flow of the wake impacting the corresponding screen tube forms a consistent flow direction along the entire circumference of the screen tube. This allows the present invention to continuously and uniformly adjust the direction of the cavitation tubes, thereby achieving a gradual transition from cavitation for descaling and unblocking to cavitation for preventing scale and protecting the screen tube. The tie rods act during the anti-scaling and tube protection stage.

[0063] In the upper screen pipe section 10, when the first hydraulic cavitation assembly 29a is in the scale prevention and pipe protection stage, the upper screen pipe section pull rod 2 is lifted, driving the wedge-shaped pad 28 to cut into the upper screen pipe section elastic plate 11, increasing the footage and deformation of the upper screen pipe section elastic plate 11. The angle and distance of the upper screen pipe section cavitation tube 13 installed on the upper screen pipe section elastic plate 11 relative to the upper screen pipe 14 change, and the erosion and damage of the upper screen pipe 14 by the cavitation shock wave and microjets generated by the first hydraulic cavitation assembly 29a are weakened, mainly achieving the purpose of changing the activity of groundwater and scaling substances and protecting the screen pipe.

[0064] Preferably, the second hydraulic cavitation assembly 29b is located outside the lower sieve section 20. It comprises multiple cavitation tubes distributed along the circumferential inner wall. These tubes are supplied with aeration pipes at their inlet points, increasing the gas nucleus content in the groundwater at these inlet points, thereby promoting cavitation bubble formation. The aeration pipes of the lower sieve section 20 are configured as lower sieve section air injection pipes 21, which are internally connected to the annular aeration pipe 18 in the upper sieve section 10.

[0065] according to Figure 1In the lower screen section 20, the hydraulic cavitation assembly base 27 is sleeved onto the lower screen section 26, with the lower screen section's rotating blades 23 facing the aquifer. The outlet ends of the multiple lower screen section cavitation tubes 25 face the lower screen section 26 and are eccentrically positioned relative to the central axis of the lower screen section 26. Groundwater from the surrounding aquifer enters the inlet end of the lower screen section cavitation tubes 25 through the conduits of the lower screen section's rotating blades 23, driving the lower screen section's rotating blades 23 to rotate at high speed. This creates an inlet vortex at the inlet end of the lower screen section cavitation tubes 25, increasing the low-pressure area within the lower screen section cavitation tubes 25 and generating cavitation bubbles within the lower screen section cavitation tubes 25. These bubbles are ejected from the outlet end of the lower screen section cavitation tubes 25 toward the wall of the lower screen section 26 in the form of cavitation shock waves and microjets, eroding the screen tube wall and scaling materials within the tube.

[0066] according to Figure 1 In the lower sieve tube section 20, the water inlet end of the lower sieve tube section cavitation tube 25 is provided with a corresponding lower sieve tube aeration port 22. A gap for accommodating the lower sieve tube aeration port 22 is defined between two adjacent lower sieve tube section rotating blades 23. The lower sieve tube aeration port 22 is provided on the annular aeration tube 18, and the annular aeration tube 18 is internally connected to the corresponding lower sieve tube section air injection pipe 21. The present invention rapidly replenishes the gas nucleus content in the water inlet end of the lower sieve tube section cavitation tube 25 through the lower sieve tube aeration port 22 to promote the formation of cavitation bubbles by the gas nuclei in the lower sieve tube section cavitation tube 25. The annular aeration device of the present invention provides point-to-point aeration for each cavitation tube, which can quickly and effectively increase the gas nucleus content at the corresponding cavitation tube water inlet, increase the probability of hydraulic cavitation, and ensure the hydraulic cavitation effect. The present invention solves the problem of excessively uniform aeration in the prior art hydraulic cavitation device, which results in the gas nucleus content in the cavitation tube not being able to be quickly increased to a high level, through the targeted annular aeration device.

[0067] In the lower screen tube section 20, the working mode of the second hydrodynamic cavitation assembly 29b in the descaling and unblocking stage is the same as that of the first hydrodynamic cavitation assembly 29a, which will not be described in detail here.

[0068] In the lower screen pipe section 20, when the second hydraulic cavitation assembly 29b is in the scale prevention and pipe protection stage, the wedge pad 28 is in operation, and the lower screen pipe section elastic plate 24 is bent and deformed due to the engagement of the wedge pad 28. The two adjacent lower screen pipe section elastic plates 24 are separated, the sealing is weakened, and the lower screen pipe section cavitation tubes 25 on the lower screen pipe section elastic plates 24 are driven to turn. At this time, the lower screen pipe section cavitation tubes 25 and the lower screen pipe 26 are no longer perpendicular to each other. The angle at which the cavitation bubbles generated by the second hydraulic cavitation assembly 29b impact the wall of the lower screen pipe 26 decreases, and the distance from the lower screen pipe 26 increases. The number of cavitation bubbles that can reach the wall of the lower screen pipe 26 and burst inside the pipe decreases, thereby reducing the cavitation damage to the lower screen pipe 26. At the same time, contaminated groundwater not only enters and exits through the lower sieve section cavitation tube 25 but also through the gap between the two adjacent lower sieve section elastic plates 24, forming a dual inlet and outlet channel. The groundwater entering and exiting through this gap does not undergo hydraulic cavitation, thus minimizing its ability to damage the lower sieve section 26. The wedge-shaped pad 28 changes the deformation of the lower sieve section elastic plates 24 and the size of the gap between the two adjacent lower sieve section elastic plates 24 by varying its height and slope.

[0069] When in the scale prevention and pipe protection stage, the lower screen pipe section pull rod 1 installed in the wiring trough 9 is lifted, driving the wedge-shaped pad 28 to cut into the lower screen pipe section elastic plate 24 to increase the footage, the deformation of the lower screen pipe section elastic plate 24 increases, and the angle and distance of the lower screen pipe section cavitation tube 25 installed on the lower screen pipe section elastic plate 24 relative to the lower screen pipe 26 change. The cavitation shock wave and micro jet generated by the second hydraulic cavitation component 29b have a weakened erosion and damage effect on the lower screen pipe 26, which mainly plays the role of changing the activity of groundwater and scaling substances and protecting the screen pipe.

[0070] Preferably, a lower screen protection tube 19 is installed outside the second hydrodynamic cavitation assembly 29b. This lower screen protection tube 19 defines a local collapse space between the second hydrodynamic cavitation assembly 29b and the surrounding aquifer, protecting the second hydrodynamic cavitation assembly 29b outside the circulation well from damage caused by the surrounding aquifer or gravel fill. Contaminated groundwater flows over the lowest point of the lower screen protection tube 19 into the local collapse space, then into the second hydrodynamic cavitation assembly 29b and lower screen 26, entering the circulation well and participating in three-dimensional vertical water circulation.

[0071] Preferably, if Figure 1 As described above, compared with the upper screen pipe section 10, the lower screen pipe section 20 has a smaller diameter, so that the lower screen pipe section 20 has a neck portion, so that the overall diameter of the lower screen pipe section 20 with the second hydrodynamic cavitation assembly 29b is no larger than the diameter of the upper screen pipe section 10, thereby reducing installation costs.

[0072] It should be noted that the above-mentioned specific embodiments are exemplary, and those skilled in the art can come up with various solutions inspired by the disclosure of the present invention, and these solutions also fall within the scope of the disclosure of the present invention and fall within the scope of protection of the present invention. Those skilled in the art should understand that the description of the present invention and its drawings are illustrative and do not constitute a limitation on the claims. The scope of protection of the present invention is defined by the claims and their equivalents. Throughout the text, the features guided by "preferably" are only an optional method and should not be understood as having to be set, so the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A hydraulic cavitation assembly for a groundwater circulation well, used to form directional tail flow cavitation bubbles to remove dirt clogged on the circulation well screen, characterized in that: The hydrodynamic cavitation assembly is installed in the screen section (10, 20) of the circulation well body (30); The hydraulic cavitation assembly includes a screen section elastic plate (11, 24), a wedge pad (28) and a screen section cavitation tube (13, 25); A plurality of the screen tube segment elastic plates (11, 24) are overlapped end to end and form a ring array, and the wedge-shaped pad (28) is accommodated between the end and end of two adjacent screen tube segment elastic plates (11, 24); The wedge-shaped pad (28) is installed on the hydrodynamic cavitation assembly base (27) and is located at the tail end of the screen tube section elastic plate (11, 24), and is engaged with the screen tube section elastic plate (11, 24) to cause bending deformation thereof; The screen tube section cavitation tube (13, 25) is arranged on the screen tube section elastic plate (11, 24), and is turned as the screen tube section elastic plate (11, 24) deforms.

2. The hydrodynamic cavitation assembly according to claim 1, characterized in that: The screen tube section elastic plate (11, 24) adopts an arc-shaped structure. The head end of the screen tube section elastic plate (11, 24) is clamped on the hydrodynamic cavitation component base (27) through a fastener, and the tail end of the screen tube section elastic plate (11, 24) is overlapped on the head end of the adjacent screen tube section elastic plate (11, 24).

3. The hydrodynamic cavitation assembly according to claim 1 or 2, characterized in that: The sieve tube section cavitation tube (13, 25) comprises a water inlet end, a water outlet end and a connecting tube; The water inlet end is connected to the water outlet end through a connecting pipe, and forms a dumbbell-shaped integrated structure with the connecting pipe, so that the cavitation tube (13, 25) of the screen tube section has a variable diameter structure; The water inlet end is located on the side of the hydrodynamic cavitation component base (27) where the wedge-shaped pad (28) is installed, and the water outlet end is located on the side away from the wedge-shaped pad (28).

4. The hydrodynamic cavitation assembly according to claim 3, characterized in that: The sieve tube section cavitation tube (13, 25) is arranged along the circumferential inner wall of the sieve tube section (10, 20), and the water inlet end of the sieve tube section cavitation tube (13, 25) is provided with an aeration port (17, 22) for air supply.

5. The hydrodynamic cavitation assembly according to claim 4, characterized in that: The hydrodynamic cavitation assembly further includes screen tube section rotating blades (15, 23); The screen tube section rotating blades (15, 23) are mounted on the outer wall of the water inlet end of the screen tube section cavitation tube (13, 25), and the outer wall of the screen tube section cavitation tube (13, 25) and the screen tube section rotating blades (15, 23) are connected via bearings.

6. The hydrodynamic cavitation assembly according to claim 5, characterized in that: The circulation well body (30) comprises an upper screen pipe (14), a lower screen pipe (26) and a packer (16), wherein the packer (16) divides the circulation well body (30) into an upper screen pipe section (10) and a lower screen pipe section (20); The hydrodynamic cavitation assembly comprises a first hydrodynamic cavitation assembly (29a) and a second hydrodynamic cavitation assembly (29b), wherein the first hydrodynamic cavitation assembly (29a) is installed in the upper screen tube section (10), and the second hydrodynamic cavitation assembly (29b) is installed in the lower screen tube section (20); The first hydraulic cavitation assembly (29a) includes an upper screen section elastic plate (11), a wedge-shaped pad (28), an upper screen section cavitation tube (13), and an upper screen section rotating blade (15); the second hydraulic cavitation assembly (29b) includes a lower screen section elastic plate (24), a wedge-shaped pad (28), a lower screen section cavitation tube (25), and a lower screen section rotating blade (23); The second hydrodynamic cavitation component (29b) has the same structure and installation method as the first hydrodynamic cavitation component (29a).

7. The hydrodynamic cavitation assembly according to claim 6, characterized in that: In the upper screen tube section (10), the hydraulic cavitation assembly base (27) is sleeved on the upper screen tube (14), and the water outlet ends of the plurality of cavitation tubes (13) of the upper screen tube section are oriented toward the upper screen tube (14) and are eccentrically arranged relative to the central axis of the upper screen tube (14); The wake cavitation bubbles include at least a component different from the radial direction when emitted from the circumferentially distributed hydrodynamic cavitation components, so that the wake flow includes at least a circumferential component of liquid flow when impacting the corresponding screen pipe in the radial direction.

8. The hydrodynamic cavitation assembly according to claim 7, characterized in that: The circumferential component of the wake can be adjusted by changing the orientation of the cavitation tube of the hydrodynamic cavitation assembly.

9. The hydrodynamic cavitation assembly according to claim 8, characterized in that: The hydraulic cavitation assembly also includes an upper screen tube section pull rod (2) and a lower screen tube section pull rod (1), and the side of the wedge pad (28) is connected to the pull rod. The wedge pads (28) arranged in the same row in the vertical direction form a group, and each group of wedge pads (28) is connected to the same vertical pull rod. The pull rod drives a group of wedge pads (28) to rise and fall synchronously. Different groups of pull rods can be connected and raised and lowered synchronously. The vertical lifting pull rod can drive a group of wedge pads (28) to fit into the elastic plate and the footage changes continuously. The orientation of each cavitation tube has the same circumferential component, so that the liquid flow flowing out of all the cavitation tubes has the same circumferential component liquid flow in the circumferential direction of the screen tube, and then the circumferential component liquid flow when the tail flow impacts the corresponding screen tube forms a flow with a consistent direction in the circumferential direction of the entire screen tube.

10. The hydrodynamic cavitation assembly according to claim 9, characterized in that: The orientations of the upper sieve tube section cavitation tube (13) and the lower sieve tube section cavitation tube (25) can be jointly adjusted, and the orientations of the sieve tube section cavitation tubes (13, 25) arranged in a row in the axial direction can be adjusted by a common adjustment mechanism.

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