Spin jet and cleaning device

Abstract

The application discloses a self-rotating nozzle, a cleaning device and a nozzle hole arrangement method. The self-rotating nozzle comprises a sleeve, one end of the sleeve being adapted to be connected with a flange; a nozzle body, one end of the nozzle body being arranged in the sleeve, and the nozzle body being rotatable relative to the sleeve, the nozzle body being provided with a plurality of nozzle holes, the plurality of nozzle holes being distributed in a spiral interval along the axial direction of the nozzle body, the jet axes of the plurality of nozzle holes being arranged in a same eccentric angle with the axis of the nozzle body, and the nozzle hole far from the one end of the sleeve being arranged in a mirror image with the nozzle hole adjacent to the one end of the sleeve and in a same eccentric angle. The self-rotating nozzle can improve the cleaning effect of the nozzle.

Description

Technical Field

[0001] This invention belongs to the field of jet equipment technology, specifically relating to a spinning nozzle and a cleaning device. Background Technology

[0002] Jet cleaning utilizes the powerful impact of a high-pressure water jet to remove scale from the inner wall of pipes. This method is characterized by low cost, high efficiency, and no pollution. The structure of the nozzle is a key factor in cleaning efficiency. The nozzle contains nozzles, and the location and number of these nozzles are crucial to the cleaning effect. Summary of the Invention

[0003] This invention aims to at least partially solve one of the technical problems in related technologies. To this end, embodiments of this invention propose a spinning nozzle that can improve the cleaning effect of the nozzle.

[0004] Embodiments of the present invention also provide a cleaning device.

[0005] The self-rotating nozzle of this invention includes: a sleeve, one end of which is adapted to be connected to a flange; a nozzle body, one end of which passes through the sleeve and is rotatable relative to the sleeve; the nozzle body has a plurality of spray holes, which are spirally spaced along the axial direction of the nozzle body; the spray axes of the plurality of spray holes are eccentrically arranged at an angle to the axis of the nozzle body; and the spray holes away from the sleeve end are mirror images of the spray holes adjacent to the sleeve end, with the same eccentric angle.

[0006] The self-rotating nozzle of this invention can improve the cleaning effect of the nozzle.

[0007] In some embodiments, the eccentricity angle of the middle nozzle among the plurality of nozzles is the same as the eccentricity angle of the nozzle at the end furthest from the sleeve.

[0008] In some embodiments, the nozzle body includes an integrally formed first segment and a second segment, wherein one of the plurality of nozzles located in the middle and one of the nozzles located away from the end of the sleeve form the first segment, and one of the plurality of nozzles located in the middle and one of the nozzles located near the end of the sleeve form the second segment, wherein the number of nozzles in the first segment is greater than or equal to the number of nozzles in the second segment.

[0009] In some embodiments, the spray direction of the nozzles in the first segment is directed away from the sleeve, and the spray directions of the plurality of nozzles in the first segment are distributed at intervals along the spiral direction of the nozzle body; and / or, the spray direction of the nozzles in the second segment is directed adjacent to the sleeve, and the spray directions of the plurality of nozzles in the second segment are distributed at intervals along the spiral direction of the nozzle body.

[0010] The cleaning device of this invention includes: a roller; a first flange and a second flange, the first flange and the second flange being connected to the roller respectively, and the first flange and the second flange being arranged opposite to each other in the axial direction of the roller; and a spinning nozzle, the spinning nozzle being connected to the first flange and located inside the roller, the spinning nozzle being the spinning nozzle described in any of the above embodiments.

[0011] In some embodiments, the cleaning device further includes a connecting assembly comprising a sleeve, an elastic element, and a rotary joint. One end of the sleeve is connected to the first flange, and the side of the sleeve away from the first flange has an opening. The elastic element and the rotary joint are located inside the sleeve. One end of the spinning nozzle extends into the sleeve and is connected to the rotary joint, and the spinning nozzle is rotatable relative to the sleeve. One end of the elastic element abuts against the rotary joint, and the other end of the elastic element abuts against the inner bottom surface of the sleeve. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the spinning nozzle according to an embodiment of the present invention.

[0013] Figure 2 This is a schematic diagram of the structure of a spinning nozzle from another angle according to an embodiment of the present invention.

[0014] Figure 3 This is a schematic diagram of the cleaning device according to an embodiment of the present invention.

[0015] Figure 4 This is an exploded view of the cleaning device according to an embodiment of the present invention.

[0016] Figure 5 This is a schematic diagram of the structure of the first flange and connecting assembly according to an embodiment of the present invention.

[0017] Figure 6 This is a partial exploded view of the cleaning device according to an embodiment of the present invention.

[0018] Figure 7 This is a schematic diagram of the modal analysis model mesh division of the cleaning device according to an embodiment of the present invention.

[0019] Figure 8This is a schematic diagram of the water volume fraction distribution at different times in time steps 1-8 of the CFD rotary jet simulation of the cleaning device according to an embodiment of the present invention.

[0020] Figure 9 This is a schematic diagram of the volume fraction distribution, velocity distribution, and eddy current state of water at different times in time steps 1-8 of the CFD rotary jet simulation of the cleaning device according to an embodiment of the present invention.

[0021] Figure 10 This is a schematic diagram of the water volume fraction distribution, velocity distribution, velocity vector distribution, and eddy current state at different times during time steps 1-8 of the CFD rotary jet simulation of the cleaning device in this embodiment of the invention.

[0022] Figure 11 This is a schematic diagram of the water velocity distribution and eddy state at different times in time steps 1-8 of the CFD rotary jet simulation of the cleaning device according to an embodiment of the present invention.

[0023] Figure 12 This is a schematic diagram of the cross-sectional velocity vector distribution at the 8th time step in a CFD rotary jet simulation of the cleaning device according to an embodiment of the present invention.

[0024] Figure 13 This is a force analysis diagram of the multi-hole rotating jet of the cleaning device according to an embodiment of the present invention.

[0025] Figure 14 This is a schematic diagram of data transfer between a stationary grid and a sliding grid according to an embodiment of the present invention.

[0026] Figure 15 A schematic diagram of jet cleaning inside a cylindrical container according to an embodiment of the present invention.

[0027] Figure 16 A schematic diagram of the model geometry of the liquid jet when the nozzle moves linearly along the direction of liquid jet flow in an embodiment of the present invention.

[0028] Figure 17 A schematic diagram of the high-pressure water jet from the CFD rotary jet simulation of the cleaning device in this embodiment of the invention converges into a cone-shaped jet. Figure label: Sleeve 1, Nozzle body 2, first hole 21, second hole 22, third hole 23, fourth hole 24, fifth hole 25, sixth hole 26, seventh hole 27, eighth hole 28, first section 201, second section 202. Roller 3, First flange 4, Second flange 5 Connecting component 6, elastic element 61, rotary joint 62, deep groove ball bearing 621, retaining ring 622, dynamic sealing washer 623, static sealing washer 624, rotating shaft tube 625. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0030] The self-rotating nozzle of this invention includes a sleeve 1 and a nozzle body 2. One end of the sleeve 1 is adapted to be connected to a flange, and one end of the nozzle body 2 is inserted into the sleeve 1. The nozzle body 2 is rotatable relative to the sleeve 1. The nozzle body 2 has a plurality of spray holes, which are spirally spaced along the axial direction of the nozzle body 2. The spray axis of the plurality of spray holes is eccentrically arranged at an angle to the axis of the nozzle body 2. The spray holes at the end away from the sleeve 1 are mirror images of the spray holes at the end adjacent to the sleeve 1 and have the same eccentric angle.

[0031] Specifically, such as Figure 1 As shown, the nozzle body 2 has a flow channel inside, which extends along the axial direction of the nozzle body 2. The inlet of the flow channel is connected to the water source, and the outlet of the flow channel is connected to multiple nozzle holes. The multiple nozzle holes are arranged at intervals in the extension direction of the spiral of the nozzle body 2. One end of the nozzle body 2 extends into the sleeve 1, and the nozzle body 2 is rotatable relative to the sleeve 1.

[0032] It should be noted that some of the nozzles spray forward, while the remaining nozzles spray backward. For example, if there are eight nozzles, six nozzles spray forward and two spray backward.

[0033] The spray axis of the nozzle has a preset angle with the axis of the nozzle body 2, and the spray direction of the nozzle at the front end is mirrored with the spray direction of the nozzle at the rear end, and the eccentric angles of the two are the same.

[0034] The self-rotating nozzle of this invention, by setting multiple nozzles, achieves multi-angle spraying, which can improve the cleaning effect of the nozzle. The axis of the nozzle has a preset angle with the axis of the nozzle body 2. The sprayed water flow generates a thrust force to form a torque, so that the water jet recoil force generated by the high-pressure water ejected from each nozzle interacts to generate a rotational torque that is greater than the frictional torque of the nozzle body 2, thereby causing the nozzle body 2 to rotate. The water flow is ejected from each nozzle to form a high-speed jet, which drives the nozzle body 2 to rotate and achieve the cleaning operation. In addition, the high-pressure water ejected from the nozzle forms a spiral trajectory along the inner surface of the pipe, covering and rinsing the inner surface of the pipe, thus affecting the cleaning efficiency. During the rotation of the nozzle body 2, the sprayed high-pressure water can converge into a conical jet, covering the dirt on the inner wall of the pipe, impacting and peeling it off, thereby improving the speed and efficiency of pipe cleaning.

[0035] In some embodiments, the eccentricity angle of the middle nozzle among the plurality of nozzles is the same as the eccentricity angle of the nozzle at the end furthest from the sleeve 1.

[0036] It should be noted that the spray direction of the nozzle at the foremost point is the same as the eccentric angle of the nozzle in the middle. That is, the eccentric angles of the nozzle in the middle, the nozzle at the foremost point, and the nozzle at the rearmost point are the same, thereby ensuring the stability of the nozzle body 2's rotation and reducing or avoiding polarization of the nozzle body 2 during rotation.

[0037] In some embodiments, the nozzle body 2 includes an integrally formed first segment 201 and a second segment 202. One of the multiple nozzles located in the middle and one of the nozzles located away from the end of the sleeve 1 form the first segment 201. One of the multiple nozzles located in the middle and one of the nozzles located near the end of the sleeve 1 form the second segment 202. The number of nozzles in the first segment 201 is greater than or equal to the number of nozzles in the second segment 202.

[0038] Specifically, such as Figure 1 and Figure 2 As shown, a nozzle at the foremost end and a nozzle in the middle form the first segment 201, and a nozzle at the rear end and a nozzle in the middle form the second segment 202. Both the first segment 201 and the second segment 202 include multiple nozzles, and the number of nozzles in the first segment 201 is greater than the number of nozzles in the second segment 202. The larger number of nozzles in the first segment 201 can provide a greater rotational torque to the nozzle body 2, ensuring the stable rotation of the nozzle body 2. The larger number of nozzles in the first segment 201 and the larger number of nozzles in the second segment 202 allows the nozzle body 2 to better clean debris located at the front end of the inner surface of the pipe.

[0039] In some embodiments, the spray direction of the nozzles in the first segment 201 is toward the direction away from the sleeve 1, and the spray directions of the plurality of nozzles in the first segment 201 are distributed at intervals along the spiral of the nozzle body 2, and / or, the spray direction of the nozzles in the second segment 202 is toward the direction adjacent to the sleeve 1, and the spray directions of the plurality of nozzles in the second segment 202 are distributed at intervals along the spiral of the nozzle body 2.

[0040] Specifically, such as Figure 1 and Figure 2As shown, the spray direction of the nozzles in the first section 201 is towards the front, and the spray direction of the nozzles in the first section 201 is arranged at intervals along the spiral line of the nozzle body 2. In other words, the spray direction of the nozzles in the first section 201 is related to the spiral angle and pitch of the spiral line of the nozzle body 2. The spray direction of the nozzles in the second section 202 is towards the rear, and the spray direction of the nozzles in the second section 202 is arranged at intervals along the spiral line of the nozzle body 2. In other words, the spray direction of the nozzles in the second section 202 is related to the spiral angle and pitch of the spiral line of the nozzle body 2.

[0041] Multiple nozzles in the first section 201 are arranged at intervals along the spiral line of the nozzle body 2, and multiple nozzles in the second section 202 are also arranged at intervals along the spiral line of the nozzle body 2. This allows high-pressure jets to be ejected from all sides of the nozzle body 2, which not only provides sufficient rotational torque for the rotation of the nozzle body 2, making the rotation of the nozzle body 2 more stable, but also forms a spiral trajectory around the inner surface of the pipe, covering and flushing the inner surface of the pipe, thereby improving the cleaning efficiency.

[0042] like Figures 3 to 6 As shown, the cleaning device of this embodiment includes a roller 3, a first flange 4, a second flange 5, and a spinning nozzle. The first flange 4 and the second flange 5 are respectively connected to the roller 3, and the first flange 4 and the second flange 5 are arranged opposite to each other in the axial direction of the roller 3. The spinning nozzle is connected to the first flange 4 and is located inside the roller 3. The spinning nozzle is the spinning nozzle of any of the above embodiments.

[0043] Specifically, such as Figures 3 to 6 As shown, the first flange 4 and the second flange 5 are arranged opposite each other in the front-rear direction. The sleeve 1 in the self-rotating nozzle is connected to the first flange 4. The nozzle body 2 is inserted into the sleeve 1 and is located inside the roller 3.

[0044] The axis of the nozzle body 2 and the axis of the roller 3 can be arranged coaxially. A high-pressure pipeline is connected to the first flange 4. One end of the high-pressure pipeline is connected to the sleeve 1, and the other end of the high-pressure pipeline is connected to the high-pressure water source. That is, the high-pressure water flows into the nozzle body 2 through the first flange 4 and the sleeve 1, and finally sprays into the roller 3 through the spray hole.

[0045] For example, the first flange 4 is provided with a mounting groove, and the sleeve 1 is locked in the mounting groove, which can improve the connection stability between the sleeve 1 and the first flange 4.

[0046] It should be noted that the axis of the nozzle body 2 and the axis of the roller 3 can also be eccentrically arranged. When the axis of the nozzle body 2 and the axis of the roller 3 are eccentrically arranged, due to the different distances between the inner surfaces of the nozzle body 2 and the roller 3, when the nozzle body 2 rotates, the area where the nozzle body 2 and the inner surface of the roller 3 are closer will be subjected to greater impact force from the high-pressure water flow, resulting in better cleaning effect compared to other areas. This area can be used as the tunneling area of ​​the roller 3 in the silt. Since the tunneling area is the first to come into contact with the silt, the probability of blockage is higher. Focusing on cleaning this area can improve the cleaning effect of the roller 3.

[0047] For example, the outer perimeter of the roller 3 is covered with perforated mesh. This design is intended to have certain advantages in agricultural irrigation. For instance, most farmland irrigation uses surface water or river water, which contains a large amount of silt, organic matter, etc., which can easily clog the filter screen. The roller 3 with perforated mesh has small groove-shaped protrusions on the outer perimeter of the perforated mesh. The protrusions can knock and break down impurities, and the perforated mesh can play a certain filtering role.

[0048] For example, during the lotus root harvesting process, the environment in the lotus pond is more complex than that in the river or canal, with a large number of dead branches and leaves, which can easily cause the filter screen of the water pump to become clogged. The mesh holes on the roller 3 can reduce the clogging to a certain extent, and together with the self-rotating nozzle, it can improve the flushing ability of the roller 3 and the ability to carry away impurities such as mud and sand adhering to the roller 3, thereby improving the cleaning efficiency and production efficiency.

[0049] In some embodiments, the cleaning device further includes a connecting assembly 6, which includes a sleeve 1, an elastic element 61, and a rotary joint 62. One end of the sleeve 1 is connected to a first flange 4, and the side of the sleeve 1 away from the first flange 4 has an opening. The elastic element 61 and the rotary joint 62 are located inside the sleeve 1. One end of a spinning nozzle extends into the sleeve 1 and is connected to the rotary joint 62, and the spinning nozzle is rotatable relative to the sleeve 1. One end of the elastic element 61 abuts against the rotary joint 62, and the other end of the elastic element 61 abuts against the inner bottom surface of the sleeve 1.

[0050] Specifically, such as Figure 5 and Figure 6 As shown, the rear end of the sleeve 1 is connected to the first flange 4, the front end of the sleeve 1 has an opening, the rotary joint 62 is located inside the sleeve 1, and the rear end of the nozzle body 2 passes through the rotary joint 62. There is an elastic element 61 between the rear end of the nozzle body 2 and the bottom of the sleeve 1. In other words, one end of the elastic element 61 abuts against the bottom of the sleeve 1, and the other end of the elastic element 61 abuts against the nozzle body 2. For example, the elastic element 61 can be a spring.

[0051] The rotary joint 62 includes a pair of deep groove ball bearings 621, a retaining ring 622, a dynamic sealing washer 623, a static sealing washer 624, and a rotary shaft tube 625. A set of deep groove ball bearings 621 are arranged at intervals in the front-rear direction. The retaining ring 622 is located on the front side of the deep groove ball bearings 621. The dynamic sealing washer 623 and the static sealing washer 624 are located on the rear side of the deep groove ball bearings 621, and the outer ring of the dynamic sealing washer 623 is fitted inside the static sealing washer 624. The rotary shaft tube 625 passes through the retaining ring 622, the deep groove ball bearings 621, and the static sealing washer 624 in sequence. The rotary shaft tube 625 is rotatable relative to the sleeve 1. The rear end of the nozzle body 2 is inserted into the rotary shaft tube 625. For example, the nozzle body 2 is connected to the rotary shaft tube 625 by a threaded connection. The retaining ring 622 can prevent external impurities from entering the sleeve 1 and the rotary joint 62. The dynamic sealing gasket 623 and the static sealing gasket 624 can prevent external impurities from entering the elastic element 61.

[0052] By setting the elastic element 61, the vibration can be reduced, and the problems of incomplete cleaning and excessive shaking during the cleaning process caused by unstable external forces can be reduced. This allows the rotating nozzle to work smoothly and quickly. It can also provide the nozzle body 2 with a range of movement in the front and back directions, so that the nozzle body 2 can move in the front and back directions. Through movement and rotation, the high-pressure jet can better clean the inner surface of the roller 3.

[0053] The following reference Figures 7 to 17 The modal analysis process and beneficial effects of the cleaning device according to embodiments of the present invention are described.

[0054] The nozzle body has multiple spray holes arranged at an angle, allowing it to spray high-pressure jets. The automatic rotation of the nozzle body is achieved by utilizing the recoil torque generated by the eccentricity of the jet. The nozzle body is divided into a first section and a second section. The spray holes in the first section spray forward, while the spray holes in the second section spray backward, i.e., reverse spraying. The recoil force of the reverse spray holes further enables the rapid rotation of the nozzle body and a self-propelled effect that increases the cleaning radiation area.

[0055] As the nozzle body rotates and the jet is ejected from the nozzle, a vortex is formed, which gives the fluid a certain shearing and swirling grinding effect. The return flow carries the broken mud back along the wall, increasing the wall friction and facilitating the scouring of soil particles adhering to the wall.

[0056] like Figure 13 As shown, the mechanism of the rotating jet cleaning with multiple nozzles is that the jet scouring is mainly based on inclined impact, which not only exerts positive impact pressure on the wall surface, but also applies parallel forces, namely radial force and tangential force, on the wall surface.

[0057] The liquid jet impacts the target surface at an oblique angle. The soil removal modes in impingement jet cleaning mainly include dissolution, scouring, erosion, and abrasion. Flowing soil is removed by dissolution or scouring, while stagnant soil is removed by erosion or abrasion. Flowing soil is easily displaced by the forces applied by the cleaning fluid and is removed by dissolution or scouring. When soil is soluble in the cleaning fluid, the cohesive interactions within the soil are less viscous than the interactions within the cleaning fluid solution, and the diffusion timescale is shorter than the cleaning timescale, resulting in dissolution.

[0058] During the rolling process, the soil undergoes deformation and displacement due to the influence of fluid flow. Buoyancy may also play a role, and a residual layer may be left on the substrate depending on wetting behavior and the dynamics of the three-phase contact line. Stagnant soil does not deform significantly under the forces applied by the washing fluid and is removed by erosion or spalling. Erosion occurs when the soil's adhesion to the substrate is greater than its cohesive strength, and thus the soil is sheared away at the interface with the washing fluid. Spalling, also known as adhesive removal, occurs in the opposite case: the soil's adhesion to the substrate is weaker than its cohesive strength, and thus the soil separates in layers or fragments.

[0059] The region near the point where a liquid jet subdivides and diffuses on a solid surface is called the stagnation zone. In the stagnation zone, the intersection of the jet's centerline and the solid surface is called the stagnation point. Soil can be classified into: (1) flowing soil; soil deformed by stress; and (ii) stationary soil. The region near the point where a liquid jet subdivides and diffuses on a solid surface is called the stagnation zone. In the stagnation zone, the intersection of the jet's centerline and the solid surface is called the stagnation point. Soil can be classified into: (1) flowing soil; soil deformed by stress; and (ii) stationary soil.

[0060] like Figure 8 As shown, the basic structural characteristics of the cleaning flow field of a rotating jet from multiple nozzles are illustrated. The flow field of the impacting liquid jet can be subdivided into three regions: 1. the jet stagnation region, 2. the radial flow region RFZ, and 3. the flow vortex region outside the hydraulic jump point.

[0061] The jet stagnation zone consists of multiple jets at different angles. At the nozzle, the jet is less affected by external forces. As the spray distance increases, the axial velocity of the jet continuously decreases. Near the wall, the fluid is more significantly affected by the wall's cleaning effect, and the axial velocity rapidly decreases within a short range. After impacting different stagnation points on the wall, the jet flows along the wall, forming a radial flow zone (RFZ). Furthermore, due to the continuous entrainment of surrounding fluid by the water jet, it undergoes strong mixing. Influenced by the wall and the jet nozzle, vortex zones form near the nozzle centerline and between the jets. The rotational changes of each water jet cause continuous changes in the vortices, resulting in a highly complex flow field. In this characteristic, the cleaning mode is determined by the soil properties and their interaction with the water flow.

[0062] See the schematic diagram of jet cleaning inside a cylindrical container. Figure 15 O represents the jet impact point, and RFZ represents the region of rapid radial flow. The shaded area is the region wetted by the liquid, and the right side shows a schematic diagram of the flow pattern on the wall.

[0063] At radius r, the flux M of momentum per unit length is determined by the following formula. It is the mass flow rate of the jet, and U is the average velocity of the liquid with a liquid film radius of r. In the formula, and These are the radius and average velocity of the jet, respectively. For the density of the liquid, This refers to the viscosity of the liquid.

[0064] The nozzle body, with a lateral impact velocity V, forms the trajectory of the cleaning zone. Within the liquid jet framework, the soil approaches the leading edge of the cleaning trajectory X with velocity V; at this point, the cleaning rate equals the jet velocity V. Vector OP represents the resultant impact velocity of the jet ejected from the nozzle, and point P represents the farthest point of the jet. For weak soils, the cleaning rate near point P will determine the final width of the cleaning zone. See the schematic diagram. Figure 15 In the formula, 'a' is a measure of the size of the cleaning area, 'M' is the local momentum flow velocity per unit width of the cleaning front, and 'k' is the velocity of the cleaning front. It is a rate constant that includes any dependence on soil strength, interaction with the matrix, and thickness.

[0065] Motion jet model: Inclined jet model: Moving nozzles, tilting jets, and lateral moving cleaning: When the jet moves in a spiral motion within the container, the jet slowly moves upward or downward as the nozzle rotates in the azimuth plane. The movement of the nozzle in the azimuth and vertical axis directions is perpendicular to the radially ejected liquid jet. For the far-field case, the moving jet model is combined with the tilting jet model.

[0066] The results of predicting the width of the jet removal zone can be used to estimate the time required to remove soil from the container wall.

[0067] The governing equations, using a three-dimensional cylindrical coordinate system, can be expressed as follows: In the formula: Radial velocity, m / s; V is the impact velocity, in m / s; V is the impact speed, in m / s.

[0068] In cylindrical coordinates, the equation of motion can be expressed as: In the formula: These are the radial, tangential, and axial components of the external force, respectively, in N; The pressure is expressed in Pa.

[0069] The transport equations for turbulent kinetic energy k and turbulent dissipation rate ε are as follows: In the formula: ,k turbulent kinetic energy m 2 / s 2 ε is the turbulent dissipation rate, m 2 / s 3 ; and For the turbulent kinetic energy k and dissipation rate ε, the Prandtl number is used. The turbulent kinetic energy generated by the average velocity gradient; This refers to the turbulent kinetic energy generated by the influence of buoyancy. The effect of compressible turbulent pulsation expansion on the total dissipation rate; The value is the molecular viscosity coefficient, expressed in Pa·s. Here is the turbulent viscosity coefficient, in Pa·s; For the source terms defined for this model; It is a constant.

[0070] This invention performs numerical simulation of a multi-orifice rotating jet under non-submerged conditions. The VOF (Volume of Fluid) model is selected as the multiphase flow model. The VOF model simulates multiphase mixed fluids by solving individual momentum equations and handling the volume fraction of fluid passing through each grid region. Its volume fraction continuity equation is: in The physical properties of the transport equation are characterized by the combination fraction, and the density of phase q in a gas-liquid two-phase flow is expressed as: Based on the structural model of the cleaning device, a sliding mesh model is used in this embodiment of the invention. The basic idea of ​​the sliding mesh model is to calculate the flow characteristics of the moving region (nozzle section) and the stationary region (external flow field section) at each computation time step. During the simulation, as the time step increases, the moving domain (generally rotational or translational) displaces according to its own velocity. During this process, the interface between the moving and stationary domains forms a new information transfer surface at each time step. Information transfer between the flow fields in the moving and stationary domains is achieved by transferring the flux on this surface. As the computation time step increases, the mesh in the stationary region remains stationary, while the mesh in the rotating region rotates, resulting in relative slippage at the interface between the two regions. At the next time step, a new interface forms on the meshes of the moving and stationary regions, and flow field information is transferred through this new interface, thus achieving coupling between the flow fields in the moving and stationary regions. A schematic diagram of data transfer between the stationary mesh formed in the stationary region and the sliding mesh formed in the moving region is shown below. Figure 14 In the slip mesh model, the mesh nodes on both sides of the interface are allowed to slide relative to each other and do not need to overlap, but the calculated flux values ​​on both sides of the interface must be equal. To obtain the flow flux at the interface, the overlapping surface of the regions on both sides of the interface is first determined at each new time step, and the flux at the interface is calculated using the overlapping mesh surface. In the numerical simulation of multi-nozzle rotating jets, a slip mesh interface is formed between the nozzle exit region and the inlet of the flow domain.

[0071] The outer flow domain of the model is a cylinder with a diameter of 300mm × 700mm, and the rotating domain is a cylinder with a diameter of 100mm × 255mm. The rotating domain surrounds the entire spiral groove nozzle and is the dynamic region. The nozzle uses an 8-hole combination, namely 6 forward-facing and lateral nozzles with a diameter of 3mm spirally distributed around the central axis, and 2 backward-facing nozzles with a diameter of 3mm. The model mesh is shown in [link to mesh]. Figure 6The system has 107,808 nodes and 574,696 elements. The inlet boundary condition is a pressure inlet with a pressure of 1 MPa, and the outlet boundary is a pressure outlet with an atmospheric pressure. The contact planes between the nozzle and the external flow field are set as interfaces. The relative motion between the nozzle and the external flow field is handled using a sliding mesh model with a rotational speed of 10 rad / s. The remaining boundaries are defined as walls, with no-slip solid wall boundaries. The initial state inside the flow field region is entirely water. The nozzle is filled with water, and the initial state inside the computational domain is entirely gas, using a VOF multiphase flow model. The Coupled algorithm based on pressure-velocity coupling is selected as the solution control, and appropriate relaxation coefficients are selected and adjusted. The pressure discretization scheme is set to standard mode, the momentum discretization scheme is first-order upwind, and the turbulent kinetic energy and turbulent dissipation rate are also set to first-order upwind. Initialization is set to mixed initialization. After checking the initialization success, and setting appropriate monitoring curves, the initialization calculation starts from the jet inlet. The calculation converges after the residual criterion is reached, and the results are obtained. The internal flow field velocity vector, vortex state, and turbulent kinetic energy distribution of the rotating jet cleaning process were obtained, as shown in the diagrams. Figures 8 to 12 As shown.

[0072] like Figure 8 As shown in the water volume distribution diagram, the nozzle body generates a high-pressure jet during rotation. The high-pressure jet generates a rotational torque, and the width of the jet increases with radial extension. Therefore, the arrangement of the nozzle holes in this application can ensure the smooth rotation of the nozzle body and obtain sufficient jet coverage width, thereby improving the cleaning efficiency of the nozzle body.

[0073] like Figure 9 As shown, based on the vortex distribution, it can be seen that as the nozzle body rotates, the high-pressure jet generates vortices, and the vortices fill the entire drum. The vortices cause the soil inside the drum to tumble, and the tumbling soil cuts and impacts the inner surface of the drum, which can further remove the soil from the inner surface of the drum.

[0074] like Figure 10 As shown, based on the water volume fraction distribution, velocity vector, and eddy current state in the cloud diagram, the axial velocity, rotational velocity, and maximum static pressure show a significant axial attenuation, while the tangential velocity exhibits a similar trend. Attenuation, axial velocity and radial velocity Attenuation, pressure then Rapid decay; except for tangential velocity, the greater the rotation, the faster the decay. As the nozzle body rotates, the high-pressure jet from the nozzle spray point disperses to the periphery of the roller, while the water flow at the front and rear ends of the roller flows towards the nozzle body. That is, the rotation of the nozzle body draws the water flow from the front and rear sides of the roller back to the periphery of the nozzle body, thus forming a water flow that disperses from the nozzle body to the periphery of the roller and then converges at the front and rear ends of the roller back to the periphery of the nozzle body, achieving cyclic cleaning of the inner wall of the roller.

[0075] like Figure 11 As shown, due to the continuous entrainment of surrounding fluid by the water jet, it undergoes strong mixing with the surrounding fluid. Influenced by the wall and the jet nozzle, the fluid forms a vortex zone near the center line of the nozzle and between each jet. The vortex formed by the high-pressure jet drives the soil to tumble inside the drum. The rotational changes of each water jet cause the vortex to change continuously. Subsequently, after the high-pressure jet impacts the inner wall of the drum, it drives the soil to form a vortex on the inner wall of the drum. The broken particles carried by the return flow of the jet fluid rotate back along the hole wall, grinding the formed hole wall. The vortex on the inner wall of the drum will cut and rub the soil adhering to the inner wall, which is conducive to further smoothing the wall surface and better removing the soil on the drum wall, thereby improving the utilization rate of jet energy and cleaning efficiency.

[0076] like Figure 12 As shown, the velocity vector of the water flow clearly demonstrates that the high-pressure jet from the nozzle extends radially along the roller and impacts the inner wall of the roller. As the nozzle body rotates, it creates a vortex, which in turn draws the water flow back towards the nozzle body, thus forming a circulating water flow that repeatedly washes the roller, improving the cleaning effect. The vortex of the rotating jet... ,in and Here, λ represents the axial flux of linear momentum and angular momentum, respectively; R is the nozzle radius; G is the maximum value of the rotational velocity and axial velocity at the nozzle, where G ≤ 0.4 represents the low-rotation case, and G > 0.4 represents the high-rotation case. In the latter case, the axial velocity distribution at the outlet deviates from a uniform distribution, and most of the fluid leaves the nozzle near the outer edge. The entrainment capacity of the jet depends on the jet thrust, density, torque, and nozzle characteristic diameter d. For low and medium-rotation jets, the entrainment capacity is related to the rotation... The change in spin is linear; however, for higher spin, the entrainment capacity changes non-linearly with spin.

[0077] like Figures 13 to 17 As shown, during multi-nozzle rotating jet cleaning, after the jet contacts the wall surface with attached soil, the wall surface will initially be subjected to axial compressive stress, radial compressive stress, and tangential compressive stress (e.g., ...). Figure 13As shown, with the deformation of the soil on the wall surface and the propagation of the jet impact stress wave within the soil-attached wall surface, pore pressure and stress field couple, generating an effective stress field. Tensile stress extremities will appear at a certain distance from the jet impact axis. The jet stagnation zone consists of multiple jets at different angles. At the nozzle, the jet is less affected by external forces. As it approaches the wall surface, the fluid is more affected by the wall cleaning process, and the compressed soil particles in the water jet contact area release energy laterally. Furthermore, as the jet diffuses across the surface, tensile shear failure occurs, causing the soil surface damage to rapidly develop inwards and outwards, creating new soil surfaces. At this point, the lower, compressed soil can release energy radially, causing further damage and creating new surfaces. The role of different erosion forms in the wall cleaning process is closely related to the jet angle; as the jet angle increases, shearing and tensile effects occur. After impacting different stagnation points on the wall, the jet flows along the wall, forming a radial flow zone RFZ (e.g., Figure 15 (As shown). Furthermore, because the position of the jet contacting the wall is constantly changing, the load on the impacting soil element is not continuous. After the jet impacts the soil surface, the impact energy decreases as the jet position changes, resulting in lower resistance to soil unloading and higher destructive energy. Secondly, as the quasi-static pressure of the water jet gradually increases, it further damages the joints and fissures in the already damaged soil, expanding the damaged area. This leads to numerous annular cracks near the fracture pit, which facilitates further cleaning and smoothing of the wall surface.

[0078] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0079] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0082] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0083] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A spinning nozzle, characterized in that, include: A sleeve, one end of which is adapted to be connected to a flange; The nozzle body has one end inserted into the sleeve and is rotatable relative to the sleeve. The nozzle body has multiple spray holes, which are spirally spaced along the axial direction of the nozzle body. The spray axis of the multiple spray holes is eccentrically arranged at an angle to the axis of the nozzle body. The spray holes at the end away from the sleeve are mirror images of the spray holes at the end adjacent to the sleeve and have the same eccentric angle. The eccentricity angle of the middle nozzle among the plurality of nozzles is the same as the eccentricity angle of the nozzle at the end furthest from the sleeve. The nozzle body includes an integrally formed first section and a second section. One of the multiple nozzles located in the middle and another nozzle located away from the end of the sleeve form the first section. One of the multiple nozzles located in the middle and another nozzle located near the end of the sleeve form the second section. The number of nozzles in the first section is greater than or equal to the number of nozzles in the second section.

2. The spinning nozzle according to claim 1, characterized in that, The spray direction of the nozzles in the first segment is directed away from the sleeve, and the spray directions of the plurality of nozzles in the first segment are distributed at intervals along the spiral direction of the nozzle body; and / or, the spray direction of the nozzles in the second segment is directed adjacent to the sleeve, and the spray directions of the plurality of nozzles in the second segment are distributed at intervals along the spiral direction of the nozzle body.

3. A cleaning device, characterized in that, include: roller; A first flange and a second flange are respectively connected to the roller, and the first flange and the second flange are arranged opposite to each other in the axial direction of the roller; A spinning nozzle, wherein the spinning nozzle is connected to the first flange and is located inside the drum, and the spinning nozzle is the spinning nozzle as described in claim 1 or 2.

4. The cleaning device according to claim 3, characterized in that, It also includes a connecting assembly comprising a sleeve, an elastic element, and a rotary joint. One end of the sleeve is connected to the first flange, and the side of the sleeve away from the first flange has an opening. The elastic element and the rotary joint are located inside the sleeve. One end of the spinning nozzle extends into the sleeve and is connected to the rotary joint, and the spinning nozzle is rotatable relative to the sleeve. One end of the elastic element abuts against the rotary joint, and the other end of the elastic element abuts against the inner bottom surface of the sleeve.

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