A pulsed cavitation abrasive jet system based on dual excitation and dual mixing

Abstract

The invention provides a pulsed cavitation abrasive jet operation system based on dual excitation and dual blending. In the field of aerospace production and assembly safety monitoring technology, the system includes: a high-pressure power assembly, a dual excitation jet assembly, a confining pressure operation assembly, and a confining pressure control water circulation assembly. The dual excitation jet assembly generates active and passive dual excitation high-frequency pulsed cavitation jets, and utilizes the combined effects of annular suction jet and flow field entrainment to achieve dual blending of surrounding abrasive particles, significantly improving jet operation efficiency. The pulsed cavitation abrasive jet operation system and method based on dual excitation and dual blending of the present invention can leverage the advantages of pulsed jet water hammer impact, cavitation jet cavitation erosion, and abrasive jet particle abrasion, providing a new solution for jet efficiency enhancement.

Description

Technical Field

[0001] The present invention relates to the field of water jets, and in particular to a pulsed cavitation abrasive jet operation system based on double excitation and double mixing. Background Art

[0002] Pulse jet is produced by the gradual discretization of continuous jet under the action of mechanical cutoff, external impact or self-excited oscillation. It can greatly reduce the water cushion effect of continuous jet. At the same time, the water hammer effect and high-frequency shock wave caused by the pulse can greatly improve the efficiency of jet operation.

[0003] Cavitation jet is a high-speed single-phase jet flowing through a specific cavity nozzle, or a gas-liquid two-phase high-speed jet produced by the phase change of the liquid under the action of ultrasound, etc. The instantaneous shock wave, micro-jets and local high temperature generated by the collapse of a large number of bubbles will produce great destructive power, enhancing the jet's destructive ability.

[0004] Abrasive jet is formed by adding abrasives such as corundum to a single-phase fluid and accelerating the ejection through a specific nozzle to form a high-speed abrasive slurry jet. It uses the sharp edge and high-speed kinetic energy of the abrasive to cut and crush the work object, greatly improving the energy utilization efficiency of pure water jet.

[0005] However, the existing system only includes one or two of the above effects, and the operation level still cannot meet the requirements of high efficiency and low energy consumption. Therefore, in order to further improve the efficiency of jet operation, the present invention proposes a pulse cavitation abrasive jet operation system and method based on dual excitation and dual mixing, which can combine the advantages of pulse-cavitation-abrasive and greatly improve the efficiency of jet operation. Summary of the Invention

[0006] To address the above problems, the present invention provides a pulsed cavitation abrasive jet operation system based on dual excitation and dual blending, which has strong erosion and crushing capabilities. It utilizes active and passive excitation cavitation to enhance the jet erosion strength, and abrasive particle blending to enhance the particle impact strength. This can greatly improve the jet operation efficiency, give full play to the advantages of the pulse-cavitation-abrasive combination, and provide a new solution for jet efficiency enhancement. Specifically, it includes:

[0007] A pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing, comprising: a high-pressure power component, a dual excitation jet component, a confining pressure operation component, and a confining pressure control water circulation component;

[0008] The high-pressure power assembly is used to provide fluid meeting a preset temperature and pressure to the dual-excitation injection assembly;

[0009] The output end of the dual-excitation jet assembly processes the workpiece to be processed in the confining pressure operation assembly;

[0010] The workpiece to be processed is installed in the confining pressure operation assembly, and the confining pressure operation assembly provides a confining pressure-controllable operation environment for the output end of the dual-excitation injection assembly;

[0011] The confining pressure control water circulation component is used to control the pressure in the confining pressure operation component;

[0012] The dual-excitation injection assembly includes a coaxially arranged resonant cavity, a horn, a spray piece and an upper cavity cover;

[0013] The horn is installed in the resonant cavity, the horn is integrally arranged, and the upper cavity cover is arranged at the top of the resonant cavity. When the horn moves upward, the upper cavity cover restricts the horn from moving upward and leaving the resonant cavity;

[0014] Two water inlets are provided in the middle of the cavity body of the resonant cavity, and the water inlets are provided at the bottom of the horn, and the horn is above and adjacent to the two water inlets;

[0015] A nozzle is provided at the bottom of the resonant cavity. The nozzle is the output end of the dual-excitation injection assembly. The nozzle includes a nozzle head and a shell. The nozzle head is a cavitation type nozzle. The nozzle blade is provided in a cavity in the nozzle head.

[0016] A mixing chamber is provided on the side wall of the nozzle and is inclined downward toward the water outlet end of the nozzle. The mixing chamber is communicated with the inner cavity of the nozzle head.

[0017] Optionally, the horn comprises a frustum, a circular cone, an arc-shaped connecting portion and a rod member which are coaxially arranged in sequence from top to bottom;

[0018] The top radius of the frustum is greater than the bottom radius of the frustum;

[0019] The bottom surface of the frustum is arranged on the upper surface of the truncated cone, and the diameter of the truncated cone is larger than the diameter of the lower bottom surface under the upper cavity cover;

[0020] The diameter of the rod is smaller than the bottom diameter of the frustum;

[0021] The top of the rod is connected to the frustum through the arc-shaped connecting portion.

[0022] Optionally, the nozzle and the resonant cavity are threadedly connected, and the nozzle and / or the resonant cavity can be replaced;

[0023] The spray piece supports axial movement and supports disassembly;

[0024] The shell contains the side wall of the nozzle head; the shell is threadedly connected to the nozzle head, and the mixing chamber is arranged on the shell.

[0025] Optionally, the dual-excitation injection assembly further comprises: a transducer, an active excitation controller and a pressure sensor;

[0026] The active excitation controller is connected to the transducer, and is used to adjust the frequency of transmitting ultrasonic waves and adjust the output power of ultrasonic waves;

[0027] The transducer is used to transmit ultrasonic waves and apply the ultrasonic waves to the horn to make the horn vibrate and generate active excitation;

[0028] The pressure sensor is disposed in the cavity of the resonant cavity, and the pressure sensor provides real-time feedback of pressure changes in the cavity of the resonant cavity.

[0029] Optionally, the high-pressure power assembly includes: a water tank, a water supply pipeline, a high-pressure pump, a first filter, a pressure gauge, a temperature regulator, a flow meter and a thermometer;

[0030] One end of the water supply pipe is connected to the water tank, and the other end of the water supply pipe is connected to the two water inlets on the resonant cavity;

[0031] In the direction from the water tank to the resonant cavity, on the water supply pipeline: the high-pressure pump, the first filter, the temperature regulator, the pressure gauge, the flow meter and the thermometer are arranged in sequence.

[0032] Optionally, the confining pressure operation assembly includes: an abrasive filling valve, an operation chamber, a target plate, a second filter and an acoustic emission sensor;

[0033] The abrasive particle filling valve controls the opening and closing of the opening for injecting abrasive particles into the working chamber;

[0034] The nozzle is placed in the working chamber, the workpiece to be processed is installed in the working chamber and on the target plate, and the workpiece to be processed corresponds to the position of the nozzle and is arranged below the nozzle;

[0035] The second filter is disposed in the working chamber and is used to prevent the abrasive particles in the working chamber from being lost along with the water flow and causing a change in density;

[0036] The acoustic emission sensor is used to detect the sound waves or elastic waves inside the workpiece to be processed, and convert the sound waves or elastic waves into electrical signals.

[0037] Optionally, the confining pressure control water circulation component includes: a back pressure valve, a third filter and a return water pipeline;

[0038] One end of the return water pipe is connected to the water tank, and the other end of the return water pipe is connected to the working chamber;

[0039] In the direction from the water tank to the working chamber, on the return water pipeline, the third filter and the back pressure valve are arranged in sequence.

[0040] Optionally, a wireless control component is also included.

[0041] The wireless control component is respectively connected to the high-pressure power component, the dual-excitation injection component, the confining pressure operation component and the confining pressure control water circulation component.

[0042] Optionally, the wireless control component includes:

[0043] A controller, a display, and a signal transmitter and receiver, wherein the controller is connected to the high-pressure power assembly, the dual-excitation injection assembly, the confining pressure operation assembly, and the confining pressure control water circulation assembly via the signal transmitter and receiver;

[0044] The display is used to display the opening pressure of the back pressure valve, the pressure of the pressure gauge, the flow rate of the flow meter and the oscillation frequency of the active excitation controller;

[0045] The controller supports regulating the opening pressure of the back pressure valve, the pressure of the pressure gauge, the flow rate of the flow meter and the oscillation frequency of the active excitation controller through the signal transmitter and receiver.

[0046] Optionally, the amplitude amplification coefficient of the amplitude transformer is m, m=D1 / D2, D1 is the diameter of the cone, D2 is the diameter of the rod, and the amplified amplitude is greater than 10 microns.

[0047] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0048] The dual-excitation jet assembly of the present invention can combine the advantages of pulse jet, cavitation jet and abrasive jet, and integrate the water hammer effect, cavitation effect and abrasive cutting effect to greatly improve the efficiency of jet operation. Secondly, under different fluid parameters such as pressure and flow, by reasonably matching the ultrasonic amplitude transformer, resonant cavity and spray blade parameters, the jet can reach the peak resonance state under active and passive dual excitation. At the same time, the mixing chamber sucks the abrasive slurry in the environment for a primary mixing, and the abrasive jet is ejected and mixed with the environmental abrasive slurry for a secondary mixing, realizing the dual mixing process of high-speed jet and abrasive.

[0049] This system forms a "hydraulic combination" of cavitation erosion and abrasive erosion, which can give full play to the respective advantages of pulse jet water hammer impact, cavitation jet erosion and abrasive jet particle erosion, further expanding the application field of jets. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0051] Figure 1 It is the system principle diagram of the present invention;

[0052] Figure 2 A comparison chart of experiments with and without mixed cavity and ultrasonic excitation;

[0053] Figure 3 This is a schematic structural diagram of the dual-excitation injection assembly of the present invention;

[0054] Figure 4 A schematic diagram of the prior art of the spray blade of the present invention;

[0055] Figure 5 This is an exploded view from a first perspective of the dual-stimulation injection assembly of the present invention;

[0056] Figure 6 An exploded view of the dual-injection assembly of the present invention from a second perspective;

[0057] Figure 7 A second perspective structural diagram of the dual-injection assembly of the present invention

[0058] Figure 8 Schematic diagram of the erosion results of the dual-excitation injection assembly of the present invention in a submerged environment and under different working conditions.

[0059] Reference numerals:

[0060] 3. High-pressure power assembly; 11. Water tank; 12. Water supply line; 13. High-pressure pump; 14. First filter; 15. Temperature regulator; 16. Thermometer; 17. Pressure gauge; 18. Flow meter;

[0061] 20. Dual-excitation injection assembly; 21. Mixing chamber; 22. Spray vane; 23. Resonant chamber; 24. Pressure sensor; 25. Upper chamber cover; 26. Amplitude transformer; 27. Transducer; 28. Active excitation controller; 29. ​​Water inlet; 26-1. Rod; 26-2. Cone; 26-3. Arc-shaped connecting portion; 26-4. Frustum;

[0062] 30. Confining pressure operation assembly; 31. Acoustic emission sensor; 32. Second filter; 33. Target plate; 34. Workpiece to be processed; 35. Working chamber; 36. Abrasive filling valve;

[0063] 40. Confining pressure control water circulation assembly; 41. Back pressure valve; 42. Third filter; 43. Return water pipeline;

[0064] 50. Wireless control component; 51. Controller; 52. Display; 53. Signal transmitter and receiver. DETAILED DESCRIPTION

[0065] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0066] Unless otherwise defined, the technical or scientific terms used in the present invention shall have the usual meaning understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the presence of at least one. Words such as "include" or "comprise" mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

[0067] It should be noted that the terms "up", "down", "left", "right", "front" and "back" used in the present invention are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0068] like Figures 1 to 8 As shown, a pulsed cavitation abrasive jetting system based on dual excitation and dual mixing includes: a high-pressure power component 10, a dual excitation jet component 20, a confining pressure operating component 30, and a confining pressure control water circulation component 40;

[0069] The high-pressure power assembly 10 is used to provide fluid meeting a preset temperature and pressure to the dual-excitation injection assembly 20;

[0070] The output end of the dual-excitation jet assembly 20 processes the workpiece 34 in the confining pressure operation assembly 30;

[0071] The workpiece 34 to be processed is installed in the confining pressure operation assembly 30, and the confining pressure operation assembly 30 provides a confining pressure controllable operation environment for the output end of the dual-excitation injection assembly 20;

[0072] The confining pressure control water circulation component 40 is used to control the pressure in the confining pressure operation component 30 .

[0073] In a specific embodiment, the dual-excitation injection assembly 20 includes a coaxially arranged resonant cavity 23, an amplitude rod 26, a spray piece 22 and an upper cavity cover 25; the amplitude rod 26 is installed in the resonant cavity 23, the amplitude rod 26 is arranged as a whole, and the upper cavity cover 25 is arranged at the top of the resonant cavity 23. When the amplitude rod 26 moves upward, the upper cavity cover 25 limits the amplitude rod 26 from moving upward and separating from the resonant cavity 23; two water inlets 29 are arranged in the middle of the cavity body of the resonant cavity 23, and the water inlet 29 is arranged at the The bottom position of the amplitude transformer 26 is above the two water inlets 29 and adjacent to the two water inlets 29; a nozzle is provided at the bottom of the resonance cavity 23, the nozzle includes a nozzle head and a shell, the nozzle head is a cavitation type nozzle, and the spray piece 22 is provided in the cavity inside the nozzle head; a mixing chamber 21 is provided on the side wall of the nozzle, which is inclined downward toward the water outlet end of the nozzle, and the mixing chamber 21 is connected with the inner cavity of the nozzle head, and the mixing chamber 21 is connected with the center of the spray piece 22.

[0074] The water inlet 29 is connected to the resonant cavity 23 and the water outlet to form a water flow path.

[0075] The mixing chamber 21 is coaxially sleeved with the central water outlet of the spray vane 22 at its bottom end. An abrasive slurry inlet is provided on the outside of the mixing chamber 21, and the inlet is connected to the mixing chamber 21. The mixing chamber 21 is coaxially sleeved with the center of the spray vane 22 and an outlet is provided on the outside. The outlet is connected to the central water outlet of the coaxial spray vane 22 and the radial inlet of the mixing chamber 21, forming a water flow. The mixing chamber 21 is coaxial with the resonant cavity 23 and is located at the end outside the resonant cavity 23. The center of the nozzle spray vane 22 is connected to the outlet of the mixing chamber 21. The upper cavity cover 25 is coaxially sleeved on the upper end outside the resonant cavity 23 and on the outside of the horn 26.

[0076] In a specific embodiment, the amplitude changing rod 26 includes a frustum 26-4, a cylindrical cone 26-2, an arc-shaped connecting portion 26-3 and a rod 26-1 coaxially arranged from top to bottom; the top surface radius of the frustum 26-4 is greater than the bottom surface radius of the frustum 26-4; the bottom surface of the frustum 26-4 is arranged on the upper surface of the cylindrical cone 26-2, and the diameter of the cylindrical cone 26-2 is greater than the diameter of the lower bottom surface under the upper cavity cover 25; the diameter of the rod 26-1 is smaller than the bottom surface diameter of the frustum 26-4; the top of the rod 26-1 is connected to the cylindrical cone 26-2 through the arc-shaped connecting portion 26-3.

[0077] In a specific embodiment, the nozzle and the resonance cavity 23 are threadedly connected, the nozzle and / or the resonance cavity 23 support replacement, the spray piece 22 supports axial movement, the spray piece 22 supports disassembly, and the shell encloses the side wall of the nozzle head; the shell is threadedly connected to the nozzle head; the mixing chamber 21 is arranged on the shell.

[0078] The mixing chamber 21 and the spray piece 22 are relatively movable in the axial direction, so that the axial relative position of the mixing chamber 21 and the water outlet piece of the mixing chamber 21 can be adjusted; and / or, the mixing chamber 21 and the spray piece 22 are detachably connected, so that either the mixing chamber 21 or the spray piece 22 can be replaced.

[0079] The resonant cavity 23 includes a connecting section at the central water outlet end of the spray plate 22; a through hole is provided in the center of the mixing cavity 21, the connecting section is sleeved in the through hole, and the connecting section and the through hole are connected by threaded fitting.

[0080] like Figure 4 As shown in the figure, the specific structure and related parameters of the nozzle head are related to the existing technology. The structural parameters and related settings of the nozzle head are related to the working environment. Generally, the parameters in the figure are set as follows: angle θ is 15-30°, L1 is 0.7-1.5d, and L2 is 1.5-3d.

[0081] Under submerged environmental conditions, key fluid parameters that affect the fluid, such as water line pressure and abrasive mixing flow rate, can be independently adjusted and optimized. In addition, the spray plate 22 of this structure is coupled with the mixing chamber 21, which is simple to operate, tightly connected, and has very high reliability. In addition, the dual-excitation injection assembly 20 uses ultrasonic pulse excitation and self-excited oscillation cavitation nozzles to greatly improve the cavitation ability of the nozzle jet. The present invention provides a nozzle with an abrasive mixing method in the mixing chamber 21, which improves the efficiency of the nozzle. The abrasive mixing medium is an environmental medium. Different abrasives can be selected as the medium according to different environments and can be recycled. It provides a new means for the application of cavitation jets under non-submerged conditions and lays the foundation for further improving the working efficiency of mixed cavitation jets under submerged conditions.

[0082] The dual-excitation jet assembly 20 uses a self-excited oscillation pulse nozzle, and generates a dual-excitation cavitation jet by adding ultrasonic pulse excitation through the amplitude rod 26 and the self-excited oscillation of the spray blade 22. According to different environmental requirements, the abrasive inlet can be suitable for different types of media, including but not limited to water, mud, rock sand, corundum and other different environmental media.

[0083] The mixing chamber 21 and the resonance chamber 23 are detachably connected so that either one of the mixing chamber 21 and the resonance chamber 23 can be replaced. The axial relative position of the mixing chamber 21 and the spray vane 22 can be adjusted; and / or, the mixing chamber 21 and the spray vane 22 are detachably connected so that either one of the mixing chamber 21 and the outer nozzle can be replaced. The resonance chamber 23 body includes a connecting section at the central water outlet end of the spray vane 22; a through hole is provided in the center of the mixing chamber 21, the connecting section is sleeved in the through hole, and the connecting section and the through hole are connected by threaded fitting;

[0084] The specific connection method of the mixing chamber 21, the dual-excitation injection assembly 20, and the upper chamber cover 25 is not limited thereto.

[0085] In this embodiment, the adjustment method of the dual-injection injection assembly 20 includes the following steps:

[0086] S1. Adjust the structural parameters of the resonant cavity 23, the horn 26, the nozzle, and the nozzle blade 22 so that the active excitation and the passive excitation frequency and phase match to achieve a peak resonance state; specifically, the following steps are included:

[0087] Before the external high-pressure water flow enters the resonance cavity 23, the structural parameters of the dual-excitation injection assembly 20 and the structural parameters of the mixing cavity 21 are adjusted, including the physical parameters of at least one of the water inlet 29, the resonance cavity 23, and the spray plate 22, and the physical parameters of at least one of the mixing cavity 21 and the water outlet.

[0088] S2. Connect the two water inlets 29 to a high-pressure water flow, so that the nozzle head is submerged and the nozzle head of the mixing-based pulsed cavitation abrasive jet nozzle is placed in operation. The pressure of the high-pressure water flow is greater than 10 MPa; specifically, the following steps are included:

[0089] Connecting the water inlet 29 to an external high-pressure water flow; adjusting the high-pressure water flow to adjust the fluid parameters of the cavitation nozzle device respectively;

[0090] The device is placed under submerged conditions, and the erosion sample is placed at the outlet end of the cavitation nozzle device to perform a double-excitation and double-mixing pulse cavitation abrasive jet operation.

[0091] When the two water inlets 29 are connected to high-pressure water flow, the amplitude of the horn 26 amplifies the vibration amplitude.

[0092] The amplitude amplification coefficient of the amplitude transformer 26 is m, m=D1 / D2, D1 is the diameter of the cone 26-2, and D2 is the diameter of the rod 26-1; the amplified amplitude is greater than 10 microns.

[0093] The structural parameters of the resonant cavity 23, the amplitude rod 26, the nozzle and the nozzle blade 22 include:

[0094] The inner diameter and length of the resonant cavity 23 , the diameter of the truncated cone 26 - 2 and the diameter of the rod 26 - 1 of the horn 26 , the water outlet diameter of the nozzle and the diameter of the spray blade 22 .

[0095] In a specific embodiment, the structural parameters of the dual-excitation injection assembly 20 are adjusted by relatively moving the position of at least one of the mixing chambers 21 and the mixing chamber 21 that meets the predetermined structural parameter requirements along the axial direction.

[0096] In a specific embodiment, the structural parameters of the dual-excitation injection assembly 20 include at least one of the following: the diameter of the water inlet 29, the diameter of the resonance cavity, the diameter of the water outlet of the spray vane 22, the material of the spray vane 22, and the natural frequency of the amplitude rod 26.

[0097] In a specific embodiment, the structural parameters of the mixing chamber 21 include at least one of the following: the inner diameter of the mixing chamber 21 , the outer diameter of the abrasive inlet of the mixing chamber 21 , and the inner diameter of the water outlet of the mixing chamber 21 .

[0098] Figure 8 The present invention provides the erosion results of the dual-excitation injection assembly 20 under different working conditions of the submerged environment, wherein Figure 8 (a) shows the erosion result of cavitation jet without mixing cavity 21 and ultrasonic excitation. The image shows that after 30 seconds of treatment, the surface has an eroded appearance, but the diameter and depth of the erosion pit are small, indicating that the jet erosion ability is weak under this working condition. Figure 8 Middle (b) shows the erosion result of pulsed cavitation jet without mixing cavity 21 and with ultrasonic excitation. The image shows that after 30 seconds of treatment, the surface shows an eroded appearance, and the diameter and depth of the erosion pit still do not increase significantly, indicating that the jet erosion ability is still weak under this working condition. Figure 8 Middle (c) shows the erosion result of pulsed cavitation abrasive jet in the presence of mixing cavity 21 and without ultrasonic excitation. The image shows that after 30 seconds of treatment, the diameter and depth of the erosion pits on the surface increase significantly, indicating that the jet has good erosion ability under this working condition. Figure 8 Middle (d) shows the erosion result of pulsed cavitation abrasive jet under the condition of mixing cavity 21 and ultrasonic excitation. The image shows that after 30 seconds of treatment, the diameter and depth of the surface erosion pit are the largest, indicating that the jet erosion ability is the strongest under this working condition.

[0099] In a specific embodiment, the dual-excitation injection assembly 20 also includes: a transducer 27, an active excitation controller and a pressure sensor 24; the active excitation controller 28 is connected to the transducer 27, and the active excitation controller is used to adjust the frequency of the transmitted ultrasonic wave and the output power of the ultrasonic wave; the transducer 27 is used to transmit ultrasonic waves and apply ultrasonic waves to the amplitude variable rod 26 to make the amplitude variable rod 26 vibrate and generate active excitation; the pressure sensor 24 is arranged in the cavity of the resonant cavity 23, and the pressure sensor 24 provides real-time feedback of the pressure changes in the cavity of the resonant cavity 23.

[0100] In a specific embodiment, the dual-excitation injection assembly 20 adopts dual excitation to generate coordinated pulse laminar flow and high-frequency vibration, thereby enhancing the kinetic energy and effect of the abrasive particles and improving processing efficiency; the abrasive particles and the working fluid are mixed in a reasonable proportion to obtain the best grinding performance and processing effect; the cavitation effect is generated by using high-frequency pulse signals, and the energy released by the formation and collapse of cavitation bubbles increases the impact force and grinding effect on the workpiece surface, thereby improving processing efficiency; and the opening size and structure of the nozzle plate 22 are adjusted to meet the processing requirements of workpieces of different materials. The active excitation controller 28 is used to adjust the frequency of the emitted ultrasonic waves to adapt to different application requirements and adjust the output power of the ultrasonic waves to affect the intensity and effect of the ultrasonic waves; the transducer 27 is used to emit ultrasonic waves and act on the amplitude rod 26 to make the amplitude rod 26 vibrate to generate active excitation; the upper cavity cover 25 is used to fix the amplitude rod 26 to prevent the amplitude rod 26 from shaking left and right during the experiment; the pressure sensor 24 can quickly detect the pressure changes in the resonant cavity 23 and can provide real-time feedback; the resonant cavity 23 can effectively enhance the signal of a specific frequency, so that the signal near the resonant frequency is amplified, and a water inlet is opened on it; the nozzle 22 is used to control the injection direction, flow rate and shape of the fluid, and is an important part for generating passive excitation; the mixing chamber 21 is used to achieve double mixing of the surrounding abrasive particles through the combined action of annular suction and flow field entrainment.

[0101] In a specific embodiment, the high-pressure power assembly 10 includes: a water tank 11, a water supply pipe 12, a high-pressure pump 13, a first filter 14, a pressure gauge 17, a temperature regulator 15, a flow meter 18 and a thermometer 16; one end of the water supply pipe 12 is connected to the water tank 11, and the other end of the water supply pipe 12 is connected to the two water inlets 29 on the resonance cavity 23; from the water tank 11 to the resonance cavity 23, on the water supply pipe 12: the high-pressure pump 13, the first filter 14, the temperature regulator 15, the pressure gauge 17, the flow meter 18 and the thermometer 16 are arranged in sequence.

[0102] The high-pressure pump 13 can receive control signals and adjust the liquid flow and pressure in real time; the temperature, pressure and flow rate of the system are continuously monitored through the temperature regulator 15, the pressure gauge 17 and the flow meter 18 to ensure the stability and consistency of the operation process.

[0103] A specific fourteenth method is that the confining pressure operation component 30 includes: an abrasive filling valve 36, a working chamber 35, a target plate 33, a second filter 32 and an acoustic emission sensor 31; the abrasive filling valve 36 controls the opening and closing of the opening for injecting abrasive particles into the working chamber 35; the nozzle is placed in the working chamber 35, the workpiece 34 to be processed is installed in the working chamber 35 and is installed on the target plate 33, the workpiece 34 corresponds to the position of the nozzle and is arranged below the nozzle; the second filter 32 is arranged in the working chamber 35 and is used to prevent the abrasive particles in the working chamber 35 from being lost; the second filter 32 only filters water, causing the abrasive particles to be lost, and the acoustic emission sensor 31 is used to detect the sound waves or elastic waves inside the workpiece 34 to be processed, and convert the sound waves or elastic waves into electrical signals.

[0104] The abrasive filling valve 36 is used to add abrasive particles into the working chamber 35, control the opening and closing state, and ensure that the working chamber 35 is completely sealed during testing; the working chamber 35 is used to provide a working environment with controllable confining pressure; the target plate 33 is used to fix the workpiece 34 to be processed; the acoustic emission sensor 31 is used to detect the sound waves or elastic waves inside the workpiece 34 to be processed and convert them into electrical signals to monitor the working status.

[0105] In a specific embodiment, the confining pressure control water circulation component 40 includes: a back pressure valve 41, a third filter 42 and a return pipe 43; one end of the return pipe 43 is connected to the water tank 11, and the other end of the return pipe 43 is connected to the working chamber 35; from the water tank 11 to the working chamber 35, on the return pipe, the third filter 42 and the back pressure valve 41 are arranged in sequence, and the back pressure valve 41 is used to adjust the pressure in the confining pressure working component 30.

[0106] In a specific embodiment, the system further includes a wireless control component 50 , which is respectively connected to the high-pressure power component 10 , the dual-excitation injection component 20 , the confining pressure operation component 30 and the confining pressure control water circulation component 40 .

[0107] The wireless control component 50 includes: a controller 51, a display 52 and a signal transmitter and receiver 53. The controller 51 is connected to the high-pressure power component 10, the dual-excitation injection component 20, the confining pressure operation component 30 and the confining pressure control water circulation component 40 through the signal transmitter and receiver 53; the display 52 is used to display the opening pressure of the back pressure valve 41, the pressure of the pressure gauge 17, the flow rate of the flow meter 18 and the oscillation frequency of the active excitation controller 28; the controller 51 supports the regulation of the opening pressure of the back pressure valve 41, the pressure of the pressure gauge 17, the flow rate of the flow meter 18 and the oscillation frequency of the active excitation controller 28 through the signal transmitter and receiver 53.

[0108] The wireless control component 50 is used to regulate the parameters in the system so that the system operates under specified conditions. The parameters include the opening pressure of the back pressure valve 41, the pressure of the pressure gauge 17, the flow rate of the flow meter 18 and the oscillation frequency of the active excitation controller 28. The wireless control component 50 allows the device to be controlled within a certain distance, thereby enhancing the convenience and flexibility of operation.

[0109] In a specific embodiment, a comparative test is conducted by controlling the variable method with the mixing chamber 21 and ultrasonic excitation as variables. The experimental flow pressure is set to 20MPa, the confining pressure is less than 0.1MPa, and the rock sample is shale. Figure 2 As shown, the shale numbered m-1 was obtained when the system had a mixing chamber 21 but no ultrasonic excitation; the shale numbered m-2 was obtained when the system had a mixing chamber 21 and ultrasonic excitation; the shale numbered m-3 was obtained when the system had no mixing chamber 21 and no ultrasonic excitation; the shale numbered m-4 was obtained when the system had no mixing chamber 21 and ultrasonic excitation. Based on the experimental results, it was concluded that both the mixing chamber 21 and ultrasonic excitation under confining pressure can improve the erosion ability of the abrasive jet. When the mixing chamber 21 and ultrasonic excitation exist at the same time, the system reaches the optimal working condition, and the jet erosion efficiency is the highest at this time.

[0110] During the test, parameters such as liquid temperature, water supply pressure, return water pressure, target distance, active structural parameters, etc. should be strictly controlled and kept consistent.

[0111] The dual-excitation jet assembly 20 of the present invention can combine the advantages of pulse jets, cavitation jets, and abrasive jets, and integrate the water hammer effect, cavitation effect, and abrasive cutting action to significantly improve the efficiency of jet operations. Secondly, under different fluid parameters such as pressure and flow, by rationally matching the parameters of the ultrasonic horn 26, the resonant cavity 23, and the spray blade 22, the jet can reach a peak resonance state under active and passive dual excitation. At the same time, the mixing chamber 21 sucks the abrasive slurry in the environment for primary mixing, and the abrasive jet is ejected and then mixed with the ambient abrasive slurry for a secondary mixing, thus achieving a dual mixing process of high-speed jet and abrasive.

[0112] This system forms a "hydraulic combination" of cavitation erosion and abrasive erosion, which can give full play to the respective advantages of pulse jet water hammer impact, cavitation jet erosion and abrasive jet particle erosion, further expanding the application field of jets.

[0113] The following points need to be explained:

[0114] (1) The drawings of the embodiments of the present invention only relate to the structures related to the embodiments of the present invention. Other structures may refer to conventional designs.

[0115] (2) For the sake of clarity, the thickness of layers or regions in the drawings used to describe the embodiments of the present invention are exaggerated or reduced, that is, these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly on" or "under" the other element or intervening elements may be present.

[0116] (3) In the absence of conflict, the embodiments of the present invention and the features therein may be combined with each other to form new embodiments.

[0117] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. The protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A pulsed cavitation abrasive jet system based on dual excitation and dual mixing, characterized in that: include: High-pressure power assembly, dual-excitation injection assembly, confining pressure operation assembly, and confining pressure control water circulation assembly; The high-pressure power assembly is used to provide fluid meeting a preset temperature and pressure to the dual-excitation injection assembly; The output end of the dual-excitation jet assembly processes the workpiece to be processed in the confining pressure operation assembly; The workpiece to be processed is installed in the confining pressure operation assembly, and the confining pressure operation assembly provides a confining pressure-controllable operation environment for the output end of the dual-excitation injection assembly; The confining pressure control water circulation component is used to control the pressure in the confining pressure operation component; The dual-excitation injection assembly includes a coaxially arranged resonant cavity, a horn, a spray piece and an upper cavity cover; The horn is installed in the resonant cavity, the horn is integrally arranged, and the upper cavity cover is arranged at the top of the resonant cavity. When the horn moves upward, the upper cavity cover restricts the horn from moving upward and leaving the resonant cavity; Two water inlets are provided in the middle of the cavity body of the resonant cavity, and the water inlets are provided at the bottom of the horn, and the horn is above and adjacent to the two water inlets; A nozzle is provided at the bottom of the resonant cavity. The nozzle is the output end of the dual-excitation injection assembly. The nozzle includes a nozzle head and a shell. The nozzle head is a cavitation type nozzle. The nozzle blade is provided in a cavity in the nozzle head. A mixing chamber is provided on the side wall of the nozzle and is inclined downward toward the water outlet end of the nozzle, and the mixing chamber is communicated with the inner cavity of the nozzle head; The confined pressure operation assembly includes: an abrasive filling valve, an operation chamber, a target plate, a second filter and an acoustic emission sensor; The abrasive particle filling valve controls the opening and closing of the opening for injecting abrasive particles into the working chamber; The nozzle is placed in the working chamber, the workpiece to be processed is installed in the working chamber and on the target plate, and the workpiece to be processed corresponds to the position of the nozzle and is arranged below the nozzle; The second filter is disposed in the working chamber and is used to prevent the abrasive particles in the working chamber from being lost; The acoustic emission sensor is used to detect the sound waves or elastic waves inside the workpiece to be processed, and convert the sound waves or elastic waves into electrical signals.

2. The pulsed cavitation abrasive jet system based on dual excitation and dual mixing according to claim 1, wherein the horn comprises a frustum, a circular cone, an arc-shaped connecting portion, and a rod member coaxially arranged in sequence from top to bottom; The top radius of the frustum is greater than the bottom radius of the frustum; The bottom surface of the frustum is arranged on the upper surface of the truncated cone, and the diameter of the truncated cone is larger than the diameter of the lower bottom surface under the upper cavity cover; The diameter of the rod is smaller than the bottom diameter of the frustum; The top of the rod is connected to the frustum through the arc-shaped connecting portion.

3. The pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing according to claim 2 is characterized in that: The nozzle and the resonant cavity are threadedly connected, and the nozzle and / or the resonant cavity can be replaced; The spray piece supports axial movement and supports disassembly; The shell contains the side wall of the nozzle head; the shell is threadedly connected to the nozzle head, and the mixing chamber is arranged on the shell.

4. The pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing according to claim 3 is characterized in that: The dual excitation injection assembly further includes: a transducer, an active excitation controller and a pressure sensor; The active excitation controller is connected to the transducer, and is used to adjust the frequency of transmitting ultrasonic waves and adjust the output power of ultrasonic waves; The transducer is used to transmit ultrasonic waves and apply the ultrasonic waves to the horn to make the horn vibrate and generate active excitation; The pressure sensor is disposed in the cavity of the resonant cavity, and the pressure sensor provides real-time feedback of pressure changes in the cavity of the resonant cavity.

5. The pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing according to claim 4 is characterized in that: The high-pressure power assembly includes: a water tank, a water supply pipeline, a high-pressure pump, a first filter, a pressure gauge, a temperature regulator, a flow meter and a thermometer; One end of the water supply pipe is connected to the water tank, and the other end of the water supply pipe is connected to the two water inlets on the resonant cavity; In the direction from the water tank to the resonant cavity, on the water supply pipeline: the high-pressure pump, the first filter, the temperature regulator, the pressure gauge, the flow meter and the thermometer are arranged in sequence.

6. The pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing according to claim 5 is characterized in that: The confining pressure control water circulation assembly includes: a back pressure valve, a third filter and a return water pipeline; One end of the return water pipe is connected to the water tank, and the other end of the return water pipe is connected to the working chamber; In the direction from the water tank to the working chamber, on the return water pipeline, the third filter and the back pressure valve are arranged in sequence.

7. The pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing according to claim 6 is characterized in that: Also includes wireless control components, The wireless control component is respectively connected to the high-pressure power component, the dual-excitation injection component, the confining pressure operation component and the confining pressure control water circulation component.

8. The pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing according to claim 7 is characterized in that: The wireless control component includes: A controller, a display, and a signal transmitter and receiver, wherein the controller is connected to the high-pressure power assembly, the dual-excitation injection assembly, the confining pressure operation assembly, and the confining pressure control water circulation assembly via the signal transmitter and receiver; The display is used to display the opening pressure of the back pressure valve, the pressure of the pressure gauge, the flow rate of the flow meter and the oscillation frequency of the active excitation controller; The controller supports regulating the opening pressure of the back pressure valve, the pressure of the pressure gauge, the flow rate of the flow meter and the oscillation frequency of the active excitation controller through the signal transmitter and receiver.

9. The pulsed cavitation abrasive jet operation system based on dual excitation and dual mixing according to claim 8 is characterized in that: The amplitude amplification coefficient of the amplitude transformer is m, m=D1 / D2, D1 is the diameter of the cone, D2 is the diameter of the rod, and the amplified amplitude is greater than 10 microns.

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