A vortex ring self-induction type shaftless fluid conveying mixing device and a control method thereof

Abstract

The application relates to the technical field of fluid machinery, and particularly discloses a vortex ring self-induction type shaftless fluid conveying and mixing device and a control method thereof. The device comprises a driving cavity, a vortex ring generating hole plate fixed at the inlet end of the driving cavity, an elastic diaphragm sealingly assembled on the side wall of the cavity, an electromagnetic driver and a controller. The vortex ring generating hole plate is provided with a streamlined scaled-through hole and has a circular-arc streamlined lip at the outlet, which is used for guiding fluid acceleration and generating regular vortex rings; the elastic diaphragm divides the cavity into a fluid channel and a diaphragm cavity; the electromagnetic driver drives the elastic diaphragm to reciprocatingly vibrate to generate periodic pulse excitation through a driving iron core; the controller outputs pulse current and is internally provided with a composite self-adaptive control algorithm to dynamically correct driving parameters. The device discards a rotating shaft and a dynamic sealing structure, fundamentally avoids medium leakage and shearing damage, realizes low-damage conveying and mixing by using vortex ring self-induction, and ensures precise and controllable flow under variable working conditions through self-adaptive adjustment.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, specifically to a vortex ring self-induced shaftless fluid conveying and mixing device and its control method, which is particularly suitable for industrial scenarios that require sealing safety, fluid shear strength, multiphase flow adaptability, and flow accuracy, such as conveying shear-sensitive culture media in biopharmaceuticals, online proportioning and mixing of chemical reaction materials, adding water treatment agents, conveying food slurry, and water supply from small and medium-sized deep wells. Background Technology

[0002] Fluid transport and mixing are fundamental operations in many industrial fields, including biopharmaceuticals, fine chemicals, food processing, and water treatment. For a long time, mainstream fluid transport equipment has been mainly divided into two categories: impeller pumps (such as centrifugal pumps) and positive displacement pumps (such as gear pumps and piston pumps). Both types of equipment rely on a rotating shaft to transmit power from an external motor to an internal impeller or rotor to pressurize and transport the fluid.

[0003] However, this traditional rotary shaft power structure brings several inherent technical defects. First, the rotary shaft must penetrate the pump body, and its dynamic sealing components will inevitably wear under long-term high-speed, pressurized operation, leading to leakage of the working medium along the shaft seal. When conveying highly corrosive, toxic, harmful, or high-value materials, leakage not only wastes materials but also causes serious safety accidents and environmental risks. Second, the operating characteristics of centrifugal pumps are significantly affected by the physical properties of the medium. When conveying multiphase fluids containing air bubbles, solid particles, or variable viscosity, phenomena such as air binding and cavitation are prone to occur, leading to a sudden drop in flow or even flow interruption, resulting in extremely poor conveying stability. Third, the high-speed shearing and squeezing action of the impeller blades or gears can cause irreversible mechanical damage to biological cells, active macromolecules, polymer chains, or solids in food slurries in the fluid, destroying product activity and quality. Fourth, in processes requiring online mixing of multiple components, traditional solutions often necessitate connecting the delivery pump and the pipeline static mixer in series. This not only increases equipment investment and pipeline pressure drop but also prolongs the process flow. Furthermore, the mixing effect is limited by the Reynolds number, making it difficult to handle the uniform mixing requirements of high-viscosity or non-Newtonian fluids. Fifth, most existing delivery systems regulate flow using throttle valves or variable frequency open-loop speed control. When the system inlet pressure or outlet back pressure fluctuates, the output flow rate drifts accordingly, making it difficult to maintain a high-precision constant flow supply and affecting the consistency of reaction ratios and product quality.

[0004] In recent years, shaftless conveying devices based on the vortex ring principle have attracted attention due to their seal-free and low-shear characteristics. The basic concept is to generate discrete vortex rings at the orifice through periodic perturbation, and then utilize the self-induced forward motion of the vortex rings to achieve unidirectional fluid transport. However, existing technologies in this area are still immature: on the one hand, the vortex ring generation structure is not streamlined for the fluid shear layer winding process; the sharp edges of the orifice easily induce local turbulence and shear layer fracture, leading to vortex ring distortion or premature breakage, resulting in a sharp decrease in conveying efficiency and mixing capacity. On the other hand, existing devices mostly use fixed-frequency drive, lacking the ability to sense and respond to disturbances in actual operating conditions such as inlet pressure, fluid viscosity, and outlet back pressure. When the operating conditions deviate from the design point, the generation state of the vortex ring deteriorates rapidly, resulting in phenomena such as multiple vortex superposition, asymmetrical vortex cores, or incomplete detachment. This not only causes significant fluctuations in the conveying flow rate but also essentially eliminates its entrainment and mixing function.

[0005] Therefore, there is an urgent need in this field for an innovative fluid transport and mixing device and adaptive control method that can simultaneously solve comprehensive problems such as dynamic seal leakage, high shear damage, transport, mixing and separation, and uncontrollable vortex ring forming quality. Summary of the Invention

[0006] The purpose of this invention is to provide a vortex ring self-induced shaftless fluid transport and mixing device and its adaptive control method, aiming to solve the technical problems of existing fluid transport and mixing equipment that rely on traditional rotating shaft power structures, such as the risk of dynamic seal leakage, damage to sensitive materials by high shear forces, uneven mixing of multi-components, and uncontrollable vortex ring forming quality. This invention uses electromagnetically driven diaphragm reciprocating vibration as the pulse excitation source instead of a rotating shaft, combined with a streamlined scaling orifice plate to precisely control the evolution of the shear layer and the vortex winding process, to generate a regular discrete vortex ring. The self-induced effect of the vortex ring enables unidirectional transport in a shaftless state, and the vortex ring's entrainment and breaking action simultaneously completes multi-component mixing. Simultaneously, it introduces dual-sensor feedback of flow rate and pressure, and a three-layer composite adaptive control algorithm to dynamically correct the driving parameters to stabilize the vortex ring's operating state, thereby achieving low leakage, low shear, efficient mixing, and precise flow control.

[0007] As a first aspect of the present invention, the present invention provides a vortex ring self-induced shaftless fluid transport and mixing device, comprising: a driving cavity; a vortex ring generating orifice plate, fixedly disposed at the inlet end of the driving cavity, the vortex ring generating orifice plate having streamlined expanding and contracting through holes, the streamlined expanding and contracting through holes being sequentially divided into a gradually converging section, a cylindrical throat and a gradually expanding diffusion section along the fluid flow direction, and the outlet of the orifice plate having an arc-shaped streamlined lip; an elastic diaphragm, sealed and assembled on the side wall of the driving cavity, dividing the internal space of the cavity into a fluid channel and a diaphragm cavity; an electromagnetic actuator, disposed on the outside of the diaphragm cavity, the built-in driving iron core being rigidly connected to the elastic diaphragm for driving the elastic diaphragm to reciprocate; a controller, electrically connected to the electromagnetic actuator for outputting periodic pulse current; the controller having a composite adaptive control algorithm internally for dynamically correcting the driving parameters of the electromagnetic actuator.

[0008] Optionally, the edge of the circular arc streamline lip is circular arc-shaped, and its radius is... R With the diameter of the throat D ratio R / D The value is 0.10~0.25.

[0009] Optionally, the diameter of the throat D The cavity diameter of the driving cavity d ratio D / d The contraction angle of the convergence segment is 0.3~0.6. α The diffusion angle of the diffusion section is in the range of 15° to 30°. β The range is 20° to 45°.

[0010] Optionally, the drive cavity is further provided with a flow guiding and rectifying section, a vortex ring crushing and mixing enhancement structure, and an outlet diffusion section in sequence along the fluid flow direction.

[0011] Optionally, the length of the flow guiding and rectifying section is 3 to 8 times the inner diameter of the driving cavity, and the outlet diffusion section has a gradually expanding structure.

[0012] Optionally, the vortex ring self-induced shaftless fluid transport and mixing device further includes a flow sensor and a pressure sensor, both of which are mounted on the drive cavity to collect operating data in real time and feed it back to the controller.

[0013] Optionally, the flow sensor is an external clamp-on ultrasonic sensor, clamped and fixed to the outer wall of the outlet pipe; the pressure sensor is a side-wall pressure tapping type, installed on the outer wall of the guide section of the drive cavity, and neither of them intrudes into the fluid channel.

[0014] Optionally, the thickness of the elastic diaphragm is 0.5mm to 3mm, and the Shore hardness is 50A to 90A; the driving frequency range of the electromagnetic actuator is 5Hz to 50Hz.

[0015] Optionally, the side wall of the drive cavity is provided with an additive injection port for injecting a second fluid to achieve online mixing.

[0016] Optionally, a one-way check valve is installed at the inlet of the fluid to be transported in the drive cavity.

[0017] Optionally, the vortex ring self-induced shaftless fluid transport and mixing device is configured as a multi-stage series vortex ring generating unit, with each stage of the vortex ring generating unit connected in series via flanges, and the throat diameter of each orifice plate decreasing or increasing sequentially.

[0018] Optionally, the multi-stage series vortex ring generating unit is a three-stage series structure, with the throat diameter of the three-stage orifice plates decreasing progressively to 24mm, 20mm, and 16mm, and the driving phase of each stage of the electromagnetic actuator differing by 120° sequentially.

[0019] Optionally, the driving phases of each electromagnetic actuator are 360° out of phase. n ,in n It is a series cascade to form a traveling wave drive.

[0020] As a second aspect of the present invention, the present invention provides a control method for a vortex ring self-induced shaftless fluid transport and mixing device, based on the vortex ring self-induced shaftless fluid transport and mixing device described in the first aspect above, the method comprising the following steps: S1. Initialize, input the target flow rate, set the initial drive frequency and duty cycle, and start the electromagnetic drive unit; S2. Vortex rings are periodically generated through the reciprocating vibration of the elastic diaphragm; S3. Collect operating condition data and transmit it back to the controller; S4. The controller performs adaptive adjustment through its internal composite adaptive control algorithm to dynamically correct the drive parameters; S5. Verify the generation stability of the vortex ring and correct the driving parameters when the vortex ring becomes unstable; S6. The generated vortex rings move forward in an induced manner, completing the mixing process; S7. Repeat steps S3 to S6 to continuously and stably deliver the mixed working conditions.

[0021] Furthermore, the composite adaptive control algorithm includes a flow tracking module, a pressure feedforward compensation module, and a vortex ring stability discrimination module; wherein, the flow tracking module uses an incremental PID algorithm to calculate the frequency adjustment based on the flow deviation, the pressure feedforward compensation module pre-corrects the pulse duty cycle based on the pressure change rate, and the vortex ring stability discrimination module determines vortex ring instability through spectrum analysis and performs frequency sweep correction.

[0022] Furthermore, the vortex ring stability discrimination module performs FFT spectrum analysis on the pressure pulsation signal, calculates the ratio of the pressure main frequency to the driving frequency, and performs frequency sweep correction when the vortex ring is determined to be unstable, so as to keep the Strouhal number in the optimal range of 0.15 to 0.5.

[0023] Furthermore, the flow tracking module employs an incremental PID algorithm, the calculation formula of which is: Δ f ( k ) = K p ∙[Δ Q ( k ) - Δ Q ( k -1)] + K i ∙Δ Q ( k ) + K d ∙[Δ Q ( k ) - 2Δ Q ( k -1) + Δ Q ( k -2)]; in, Δf(k) This is the frequency adjustment amount for this cycle. ΔQ For flow deviation, K p , K i , K d These are the proportional, integral, and differential coefficients, respectively.

[0024] Compared with the prior art, the present invention discloses at least the following beneficial effects: This invention generates a regular discrete vortex ring by setting a vortex ring generating orifice plate fixed at the inlet end of the drive cavity, and utilizing the gradually converging section, cylindrical throat and gradually expanding diffusion section distributed sequentially along the flow direction on it, in conjunction with the arc streamline lip at the outlet of the orifice plate, so that the fluid undergoes smooth acceleration, stable shear layer winding and controllable shedding in sequence when passing through, thereby generating a regular discrete vortex ring without the need for a rotating shaft and impeller.

[0025] Meanwhile, since the elastic diaphragm is sealed to the side wall of the drive chamber and divides the internal space of the chamber into a fluid channel and a diaphragm cavity, the electromagnetic actuator can generate periodic pulse excitation by driving the diaphragm to reciprocate through the drive core. There is no through shaft or dynamic seal structure inside the drive chamber, which completely avoids the risk of shaft seal leakage and eliminates the shearing damage of the medium by the high-speed impeller or gear.

[0026] Based on this, the controller outputs periodic pulse current and dynamically corrects the driving parameters with the help of a composite adaptive control algorithm, so that the vortex ring can still maintain stable generation and self-induced forward movement under varying working conditions, ensuring accurate and controllable conveying flow rate. It also utilizes the vortex ring's own entrainment and subsequent crushing action to simultaneously complete the mixing of multiple components, thereby achieving a comprehensive effect of low leakage, low damage, efficient mixing and stable conveying. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic cross-sectional view of the vortex ring self-induced shaftless fluid transport and mixing device proposed in this invention. Figure 2 This is a partially enlarged cross-sectional schematic diagram of the lip of the vortex ring generating orifice plate in the device of the present invention; Figure 3 This is a schematic diagram of the vortex ring self-induced propagation and mixing process of the present invention; Figure 4 This is a schematic diagram of the assembly of the multi-stage series decreasing booster scheme of the present invention; In the diagram: 1. Drive chamber; 2. Vortex ring generating orifice plate; 3. Flow guiding and rectifying section; 4. Outlet diffuser section; 5. Additive injection port; 6. One-way check valve; 7. Inlet of fluid to be transported; 8. Outlet pipe; 9. Drive core; 10. Vortex ring crushing and mixing reinforcement structure; 11. Elastic diaphragm; 12. Electromagnetic actuator; 13. Controller; 14. Flow sensor; 15. Pressure sensor; 21. Through hole; 22. Circular arc streamline lip; 31. Vortex ring; 41. First-stage vortex ring generating unit; 42. Second-stage vortex ring generating unit; 43. Third-stage vortex ring generating unit; 44. Flange connection; 45. Multi-stage system inlet; 46. Multi-stage system outlet. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] Example 1 Reference Figure 1 As shown, Embodiment 1 of the present invention provides a vortex ring self-induced shaftless fluid transport and mixing device, including a drive cavity 1, a vortex ring generating orifice plate 2, an elastic diaphragm 11, an electromagnetic actuator 12, a controller 13, a flow sensor 14, and a pressure sensor 15.

[0032] Specifically, in this embodiment, the drive cavity 1 is a shaftless tubular shell, with no rotating impeller or through shaft inside, and the fluid channel is fully open. The drive cavity 1 has an inlet 7 for the fluid to be transported and an outlet pipe 8 at its two ends.

[0033] The vortex ring generating orifice plate 2 is fixedly installed at the inlet end of the drive cavity 1, and the orifice plate is provided with a streamlined scaling through hole 21.

[0034] The elastic diaphragm 11 is sealed and assembled on the side wall of the drive cavity 1, and divides the internal space of the cavity into a fluid channel and a diaphragm cavity.

[0035] The electromagnetic actuator 12 is arranged on the outside of the diaphragm cavity, and its built-in drive core 9 is rigidly connected to the elastic diaphragm 11.

[0036] The flow sensor 14 is an external clamp-on ultrasonic sensor, which is clamped and fixed to the outer wall of the outlet pipe 8; the pressure sensor 15 is a side-wall pressure tapping type, which is installed on the outer wall of the guide section of the drive cavity. Neither of them intrudes into the fluid channel to avoid interfering with the vortex ring motion.

[0037] The controller 13 is electrically connected to the electromagnetic driver 12, the flow sensor 14, and the pressure sensor 15, respectively, and is used to output periodic pulse current. It also has a composite adaptive control algorithm built in.

[0038] Based on the above embodiments, referring to Figure 2 As shown, the streamlined scaling through-hole 21 on the vortex ring generating orifice plate 2 is divided into a gradually converging section, a cylindrical throat, and a gradually expanding diffusion section along the fluid flow direction.

[0039] In one specific embodiment, the throat diameter DWith cavity diameter d The ratio D / d is set to 0.3~0.6. The contraction angle of the convergence segment... α The diffusion angle of the diffusion section is between 15° and 30°. β The range is between 20° and 45°.

[0040] Furthermore, the orifice plate outlet is provided with an arc-shaped streamline lip 22, the edge of which is arc-shaped with a radius of curvature. R With the diameter of the throat D ratio R / D The value is 0.10~0.25. The circular streamline lip 22 can effectively reduce the shear layer separation resistance, thereby ensuring that the vortex ring can be completely rolled up and detached.

[0041] Based on the above embodiments, the elastic diaphragm 11 is made of an elastomer material. The thickness of the elastic diaphragm 11 is 0.5mm to 3mm, and the Shore hardness is 50A to 90A.

[0042] Based on the above embodiments, the driving frequency range of the electromagnetic driver 12 is 5Hz~50Hz, and the controller 13 achieves stepless control of the flow rate by adjusting the frequency and duty cycle.

[0043] During equipment operation, controller 13 drives electromagnetic actuator 12 to reciprocate the elastic diaphragm 11. During the diaphragm pull-back phase, fluid is accelerated and drawn in through the dilating orifice 21, forming a shear layer at the orifice opening. During the diaphragm push-out phase, this shear layer winds up to form discrete vortex rings, which propagate autonomously towards the outlet by self-induced velocity, simultaneously completing fluid transport and mixing.

[0044] like Figure 3 As shown, the vortex ring 31 moves forward along the cavity under self-induction and achieves entrainment and mixing in the subsequent process.

[0045] To ensure stable generation of the vortex ring, the driving conditions must satisfy the Strouhal number. St=fD / U ∈[0.15,0.5], where U The average flow velocity at the throat is given. Within this range, each vibration cycle can generate a complete and undistorted discrete vortex ring.

[0046] Reference Figure 3 As shown, the drive cavity 1 is provided with a flow guiding and rectifying section 3, a vortex ring crushing and mixing reinforcement structure 10 and an outlet diffusion section 4 arranged sequentially along the fluid flow direction.

[0047] Furthermore, the length of the flow guiding and rectifying section 3 is 3 to 8 times the inner diameter of the cavity, which is used to stabilize the fluid flow.

[0048] Furthermore, the vortex ring crushing and mixing reinforcement structure 10 is a perforated plate, which serves to strengthen the vortex ring crushing to achieve micro-mixing.

[0049] Furthermore, the outlet diffusion section 4 has a gradually expanding structure, which is used to recover fluid kinetic energy.

[0050] In addition, an additive injection port 5 is provided on the side wall of the cavity for injecting a second fluid to achieve online mixing. A one-way check valve 6 is installed at the fluid inlet to prevent fluid backflow.

[0051] In one specific embodiment, the composite adaptive algorithm built into the controller 13 includes three core modules: a flow tracking module, a pressure feedforward compensation module, and a vortex ring stability discrimination module.

[0052] Furthermore, the flow tracking module employs an incremental PID algorithm, using the deviation between the measured flow and the target flow as input, and outputting a driving frequency adjustment amount.

[0053] Furthermore, the pressure feedforward compensation module adjusts the pulse duty cycle in advance based on the pressure change rate to suppress flow deviation caused by pipeline pressure disturbances.

[0054] Furthermore, the vortex ring stability discrimination module performs FFT spectrum analysis on the pressure pulsation signal, extracts the pressure main frequency and compares it with the driving frequency to determine the stability of vortex ring shedding. When it is unstable, it automatically sweeps the frequency to correct the driving frequency so that the Struhal number returns to the optimal range.

[0055] Embodiment 1 of this invention abandons the traditional rotating shaft power structure and uses the reciprocating vibration of an electromagnetic actuator 12 and an elastic diaphragm 11 as the fluid excitation source. The drive chamber 1 has no penetrating shaft or rotating impeller, and the fluid passage is completely unobstructed. This shaftless design fundamentally avoids the problem of working medium leakage caused by long-term wear of the rotating shaft dynamic seal in traditional vane pumps and positive displacement pumps. It is particularly suitable for conveying highly corrosive, toxic, harmful, high-value, or biologically active media, significantly reducing safety risks and environmental pollution hazards, while also reducing the waste of high-value materials.

[0056] In Embodiment 1 of this invention, the unidirectional propulsion of fluid is achieved by relying on the self-inducing effect of the vortex ring. The streamlined scaling through-hole 21 and the arc-shaped streamlined lip 22 of the vortex ring generating orifice plate (2) work together to ensure that the fluid only experiences controllable low shear stress during the entire process of acceleration, shear layer entanglement, and vortex ring shedding, without the squeezing or cutting action of high-speed impeller blades or gears. Test data from Embodiment 1 show that no cell damage occurs when the device of this invention is used to transport cell culture medium, verifying its ultra-low shear characteristics. Therefore, this invention is particularly suitable for high-quality transportation of shear-sensitive fluids such as stem cells, CHO cell culture medium, fermentation slurry in biopharmaceuticals, fruit beverages and yogurt sauces in food processing, and fine chemical materials containing high molecular weight polymers.

[0057] Furthermore, the comparative test results of Example 1 show that when using the complete composite adaptive algorithm of this invention, the flow fluctuation amplitude can be controlled within ±1.8%; while when the vortex ring spectrum correction module is removed and only ordinary PID control is used, the flow fluctuation amplitude is as high as ±12%, and problems such as vortex ring breakage and uneven mixing are prone to occur. It can be seen that this embodiment has achieved a leapfrog improvement over the existing technology in terms of precise flow control and adaptive operation, and can meet the extremely strict process requirements of flow constantness and repeatability, such as fine chemical formulation and biopharmaceutical perfusion culture.

[0058] Example 2 Reference Figure 4 As shown, Embodiment 2 of the present invention provides another vortex ring self-induced shaftless fluid transport and mixing device. In this embodiment, the device is configured as a multi-stage series vortex ring generating unit, such as a three-stage series structure.

[0059] The above-mentioned three-stage series structure has a multi-stage system inlet 45 at one end and a multi-stage system outlet 46 at the other end. Fluid flows in from the multi-stage system inlet 45, is transported step by step through each stage unit, and is discharged from the multi-stage system outlet 46.

[0060] The first-stage vortex ring generating unit 41, the second-stage vortex ring generating unit 42, and the third-stage vortex ring generating unit 43 are assembled in series via flange connection 44. The throat diameter of each orifice plate can increase or decrease sequentially, and the driving phase difference of each electromagnetic actuator is 360°. n This creates a traveling wave drive to reduce pressure pulsation, and the stacking of multiple units can increase the conveying head.

[0061] In this embodiment, the throat diameter of the three-stage orifice plate decreases progressively in increments of 24mm, 20mm, and 16mm. The phases of the three-stage electromagnetic drives differ by 120° sequentially. Each stage cavity is equipped with an independent pressure sensor, while the outlet shares a common flow sensor. The main controller uniformly regulates the total flow rate, and each stage independently completes vortex ring stability correction. This solution is suitable for applications requiring high lift, such as deep well water extraction and high-rise secondary water supply, and exhibits good transport stability for water containing air bubbles.

[0062] This invention's single-stage device can meet the general conveying and mixing needs for medium flow rates and low head. Through the multi-stage series configuration shown in Example 2 (such as a three-stage series configuration, with decreasing throat diameters at each orifice plate and sequentially 120° phase differences in the driving phase), the head can be progressively stacked, and pressure pulsations can be offset by traveling wave drive, making it suitable for high-head scenarios such as deep well water extraction and secondary water supply in high-rise buildings. Each unit can independently perform vortex ring stability correction, and the main controller uniformly regulates the total flow rate, demonstrating the high flexibility and scalability of this invention in industrial applications.

[0063] In the three-stage series configuration of Example 2, even if the water contains a small amount of air bubbles, the device of the present invention can still deliver water stably without the need for a pre-venting device. This demonstrates that the present invention can reliably handle multiphase mixtures such as gas-liquid and solid-liquid, and its applicability is significantly wider than that of traditional centrifugal pumps.

[0064] Example 3 Embodiment 3 of the present invention provides yet another vortex ring self-induced shaftless fluid transport and mixing device. Embodiment 2, based on Embodiment 1 above, provides a specific single-stage adaptive basic embodiment.

[0065] In this embodiment, the inner diameter of the driving cavity 1 d It is 40mm long and has a total length of 40mm. L The throat diameter of the vortex ring generating orifice plate 2 is 300mm. D It is 20mm. D / d =0.5, contraction angle α The diffusion angle is 20°. β The angle is 30°, and the radius of the lip arc is... R It is 3mm. R / D =0.15.

[0066] Based on the above embodiments, the elastic diaphragm 11 is further made of fluororubber with a thickness of 1.5 mm and a Shore hardness of 70A. The rated driving frequency of the electromagnetic actuator 12 is 20 Hz, at which time the corresponding Strouhal number is... St =0.21, which is within the optimal range.

[0067] Based on the above embodiments, an ultrasonic flow sensor 14 is further clamped on the outer wall of the outlet pipe 8, and a piezoresistive pressure sensor 15 is configured in the middle section of the drive cavity 1.

[0068] Based on the above embodiments, the controller 13 is further equipped with a composite adaptive algorithm, wherein the proportional coefficient K p Set to 0.8, integral coefficient K i Set to 0.15, differential coefficient K d The threshold values ​​are set to 0.05, the pressure change rate threshold is set to 0.5 kPa / s, and the vortex ring instability judgment threshold is set to 0.05.

[0069] In this embodiment, the elastic diaphragm 11 reciprocates at a frequency of 20Hz, completing the entire process of negative pressure liquid absorption, shear layer formation, vortex winding of the vortex ring 31, and vortex ring 31 shedding in each cycle. The controller 13 automatically adjusts the vibration frequency according to the set flow rate. When the pipeline pressure fluctuates, the duty cycle is adjusted through feedforward compensation, and the pressure spectrum is analyzed every 100ms. When the vortex ring becomes disordered, the frequency is automatically swept and corrected. After the material is added through the additive injection port 5, it is synchronously conveyed and mixed with the vortex ring, resulting in a uniformly mixed and stable output fluid. Tests show that when using this composite adaptive algorithm, the flow rate fluctuation can be controlled within ±1.8%, which is significantly better than the ±12% fluctuation without the vortex ring spectrum correction module.

[0070] Example 4 In the application scenario of fine chemical mixing, Embodiment 4 of the present invention also provides another vortex ring self-induced shaftless fluid conveying and mixing device. In this embodiment, the additive injection port 5 is equipped with an auxiliary flow sensor, and the controller 13 adopts dual closed-loop adaptive logic. The main loop controls the main fluid flow rate, while the auxiliary loop synchronously adjusts the additive delivery amount to maintain a fixed material ratio. The vortex ring online mixing process eliminates the need for a pre-reactor mixing device, and the adaptive flow regulation effectively ensures the accuracy of the reactant ratio, making it particularly suitable for rapid chemical reaction systems such as polymerization and nitration.

[0071] Example 5 Embodiment 5 of the present invention provides a control method for a vortex ring self-induced shaftless fluid transport and mixing device, which is implemented based on the vortex ring self-induced shaftless fluid transport and mixing device described in any of the above embodiments. The method includes the following steps: Step S1, Initialization: Controller 13 inputs the target flow rate, sets the initial drive frequency and duty cycle, and starts the electromagnetic drive unit.

[0072] Step S2, vortex ring periodic generation: The elastic diaphragm 11 reciprocates and vibrates, and completes fluid intake and shear layer winding through two steps of pull-back and push-out, generating a single complete vortex ring 31.

[0073] Step S3, real-time signal acquisition: The external clamp-on flow sensor 14 and the side-wall pressure sensor 15 continuously acquire operating data and transmit it back to the controller 13.

[0074] Step S4, Adaptive flow closed-loop regulation: The incremental PID module of controller 13 calculates the frequency correction amount and combines it with the pressure change rate to complete the feedforward duty cycle compensation and update the drive parameters.

[0075] Step S5, vortex ring stability verification: Controller 13 analyzes the pressure spectrum through FFT, compares the main frequency with the drive frequency, and performs frequency sweep self-correction when there is an anomaly.

[0076] Step S6, Vortex ring propagation and mixing: The generated vortex ring 31 moves forward in a self-induced manner, entraining the surrounding fluid to complete macroscopic mixing; the vortex ring 31 breaks apart after impacting the broken structure, achieving microscopic fine mixing.

[0077] Step S7: Repeat steps S3 to S6 to continuously and stably deliver the mixed working conditions.

[0078] In a specific embodiment of this control method, the calculation formula for the incremental PID flow tracking module is as follows: Δ f ( k ) = K p ∙[Δ Q ( k ) - Δ Q ( k -1)] + K i ∙Δ Q ( k ) + K d ∙[Δ Q ( k ) - 2Δ Q ( k -1) + Δ Q ( k -2)]; in, Δf(k) This is the frequency adjustment amount for this cycle. ΔQ For flow deviation, K p , K i , K d These are the proportional, integral, and differential coefficients, respectively.

[0079] The pressure feedforward compensation module is based on the pressure change rate. dP / dt The pulse duty cycle is corrected in advance. The vortex ring spectrum stability correction module calculates the pressure main frequency. f main With drive frequency f ratio r = f main / f When |r-1|>0.05, the vortex ring is determined to be unstable. The frequency is swept within the range of ±10% of the current frequency, and the frequency with the largest spectral amplitude and the highest main frequency matching degree is selected as the new driving frequency, so as to maintain the Strouhal number in the optimal range.

[0080] This invention overcomes the limitations of traditional open-loop frequency conversion regulation or single-loop PID control, and specifically designs a three-layer composite adaptive algorithm for the discrete pulse flow characteristics of vortex rings. Among them, the incremental PID flow tracking module achieves rapid flow response without static error; the pressure feedforward compensation module calculates the flow rate based on the pressure change rate (…). dP / dt The pulse duty cycle is adjusted in advance to effectively suppress flow drift caused by inlet pressure or outlet back pressure fluctuations; the vortex ring spectrum stability correction module performs FFT spectrum analysis on the pressure pulsation signal, compares the pressure main frequency and drive frequency in real time, automatically identifies the vortex ring distortion and instability state and performs frequency sweep correction to ensure the Strouhal number ( St It consistently remains within the optimal range of 0.15 to 0.5.

[0081] In summary, this invention significantly outperforms existing vane pumps, positive displacement pumps, and conventional vortex conveying devices in terms of sealing safety, media adaptability, integrated mixing, flow control accuracy, and vortex ring generation stability. It provides an innovative, practical, and economical comprehensive solution for fields such as biopharmaceuticals, fine chemicals, water treatment, food processing, and water supply and drainage.

[0082] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, 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, and therefore should not be construed as a limitation of this invention.

[0083] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A vortex ring self-induced shaftless fluid transport and mixing device, characterized in that, include: Drive cavity (1); A vortex ring generating orifice plate (2) is fixedly installed at the inlet end of the driving cavity (1). A streamlined scaling through hole (21) is provided on the vortex ring generating orifice plate (2). The streamlined scaling through hole (21) is divided into a gradually converging section, a cylindrical throat and a gradually expanding diffusion section along the fluid flow direction. An arc streamlined lip (22) is provided at the outlet of the orifice plate. An elastic diaphragm (11) is sealed and fitted to the side wall of the drive cavity (1), and divides the internal space of the cavity into a fluid channel and a diaphragm cavity; An electromagnetic actuator (12) is arranged on the outside of the diaphragm cavity. Its built-in driving iron core (9) is rigidly connected to the elastic diaphragm (11) and is used to drive the elastic diaphragm (11) to reciprocate. The controller (13) is electrically connected to the electromagnetic driver (12) and is used to output periodic pulse current; the controller (13) is equipped with a composite adaptive control algorithm for dynamically correcting the driving parameters of the electromagnetic driver (12).

2. The vortex ring self-induced shaftless fluid transport and mixing device according to claim 1, characterized in that, The edge of the circular arc streamline lip (22) is circular arc-shaped, and its radius is circular arc. R With the diameter of the throat D ratio R / D The value is 0.10~0.

25.

3. The vortex ring self-induced shaftless fluid transport and mixing device according to claim 1, characterized in that, The diameter of the throat D The cavity diameter of the driving cavity (1) d ratio D / d The contraction angle of the convergence segment is 0.3~0.

6. α The diffusion angle of the diffusion section is in the range of 15° to 30°. β The range is 20° to 45°.

4. The vortex ring self-induced shaftless fluid transport and mixing device according to claim 1, characterized in that, The drive cavity (1) is also provided with a flow guiding and rectifying section (3), a vortex ring crushing and mixing reinforcement structure (10) and an outlet diffusion section (4) in sequence along the fluid flow direction.

5. The vortex ring self-induced shaftless fluid transport and mixing device according to claim 4, characterized in that, The length of the flow guiding and rectifying section (3) is 3 to 8 times the inner diameter of the driving cavity (1), and the outlet diffusion section (4) is a gradually expanding structure.

6. The vortex ring self-induced shaftless fluid transport and mixing device according to claim 1, characterized in that, It also includes a flow sensor (14) and a pressure sensor (15), both of which are mounted on the drive cavity (1) for real-time acquisition of operating data and feedback to the controller (13).

7. The vortex ring self-induced shaftless fluid transport and mixing device according to claim 6, characterized in that, The flow sensor (14) is an external clamp-on ultrasonic sensor, which is clamped and fixed on the outer wall of the outlet pipe (8); the pressure sensor (15) is a side-wall pressure tapping type, which is installed on the outer wall of the guide section of the drive cavity (1), and neither of them invades the inside of the fluid channel.

8. The vortex ring self-induced shaftless fluid transport and mixing device according to claim 1, characterized in that, The thickness of the elastic diaphragm (11) is 0.5mm to 3mm, and the Shore hardness is 50A to 90A; the driving frequency range of the electromagnetic driver (12) is 5Hz to 50Hz.

9. A control method for a vortex ring self-induced shaftless fluid transport and mixing device as described in any one of claims 1 to 8, characterized in that, Includes the following steps: S1. Initialize, input the target flow rate, set the initial drive frequency and duty cycle, and start the electromagnetic drive unit; S2. The vortex ring (31) is periodically generated by the reciprocating vibration of the elastic diaphragm (11). S3. Collect operating condition data and send it back to the controller (13). S4. The controller (13) performs adaptive adjustment through its internal composite adaptive control algorithm to dynamically correct the driving parameters; S5. Verify the generation stability of the vortex ring (31) and correct the driving parameters when the vortex ring (31) becomes unstable; S6. The generated vortex ring (31) moves forward in an induced manner to complete the mixing; S7. Repeat steps S3 to S6 to continuously and stably deliver the mixed working conditions.

10. The control method of the vortex ring self-induced shaftless fluid transport and mixing device according to claim 9, characterized in that, The composite adaptive control algorithm includes a flow tracking module, a pressure feedforward compensation module, and a vortex ring stability discrimination module. The flow tracking module uses an incremental PID algorithm to calculate the frequency adjustment based on the flow deviation. The pressure feedforward compensation module pre-corrects the pulse duty cycle based on the pressure change rate. The vortex ring stability discrimination module determines vortex ring instability through spectrum analysis and performs frequency sweep correction.

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