A pulsed cavitation abrasive jet nozzle based on a mixing chamber and an adjustment method thereof

Abstract

The present invention provides a pulsed cavitation abrasive jet nozzle based on a mixing chamber and an adjustment method thereof. In the field of water jet technology, the structure comprises: a coaxially arranged resonant chamber, a variable amplitude rod, a spray plate and an upper chamber cover; when operating, high-pressure water enters from a water inlet and is sprayed out through the spray plate below the resonant chamber, while the ultrasonic variable amplitude rod applies active pulse excitation, and the jet pulse is fed back to the resonant chamber through the spray plate to generate passive excitation, and the active and passive excitations are matched to form a double excitation resonance, and a mixing chamber is provided downstream of the spray plate, and abrasive particles are introduced into the mixing chamber by a high-speed jet at a low pressure, mixed with the pulsed cavitation jet once inside the mixing chamber, ejected from the mixing chamber outlet after being fully accelerated, and mixed with the abrasive particles in the submerged fluid for a second time below the nozzle, finally forming a pulsed cavitation abrasive jet based on double excitation and double mixing, and the present invention synergistically utilizes the pulsed jet water hammer effect, the cavitation jet cavitation ability and the jet abrasive cutting effect, thereby greatly improving the jet erosion and crushing ability.

Description

Technical Field

[0001] The invention relates to the field of water jets, and in particular to a pulsed cavitation abrasive jet nozzle based on a mixing chamber and an adjustment method thereof. 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 jet generated by the existing nozzle 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 the jet operation. Summary of the Invention

[0006] To solve the above problems, the present invention provides a pulsed cavitation abrasive jet nozzle based on a mixing chamber and an adjustment method thereof, which can combine the advantages of pulse, cavitation and abrasive to significantly improve the efficiency of jet operation, specifically including:

[0007] A pulsed cavitation abrasive jet nozzle based on a mixing chamber comprises: a coaxially arranged resonant cavity, a horn, a spray piece and an upper chamber cover;

[0008] 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;

[0009] 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, above the two water inlets and adjacent to the two water inlets;

[0010] A nozzle is provided at the bottom of the resonant cavity, the nozzle comprising a nozzle head and a shell, the nozzle head being a cavitation type nozzle, and the nozzle blade is provided in a cavity within the nozzle head;

[0011] 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 and is communicated with the center of the spray piece.

[0012] 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;

[0013] The top radius of the frustum is greater than the bottom radius of the frustum;

[0014] 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;

[0015] The diameter of the rod is smaller than the bottom diameter of the frustum;

[0016] The top of the rod is connected to the frustum through the arc-shaped connecting portion.

[0017] Optionally, the nozzle and the resonant cavity are threadedly connected, and the nozzle and / or the resonant cavity can be replaced.

[0018] Optionally, the spray piece supports axial movement and the spray piece supports disassembly.

[0019] Optionally, the housing contains the side wall of the nozzle head;

[0020] The housing is threadedly connected to the nozzle head;

[0021] The mixing chamber is arranged on the shell.

[0022] A method for adjusting a pulsed cavitation abrasive jet nozzle based on a mixing chamber, using the pulsed cavitation abrasive jet nozzle based on a mixing chamber, comprises the following steps:

[0023] Adjusting the structural parameters of the resonant cavity, horn, nozzle, and nozzle blades to match the frequency phases of active excitation and passive excitation to achieve a peak resonance state;

[0024] The two water inlets are connected to a high-pressure water flow so that the nozzle head is submerged, and the nozzle head of the pulsed cavitation abrasive jet nozzle based on the mixing chamber is put into operation.

[0025] Optionally, it is characterized in that the pressure of the high-pressure water flow is greater than 10 MPa.

[0026] Optionally, when the two water inlets are connected to high-pressure water flow, the amplitude transformer can amplify the vibration amplitude.

[0027] The amplitude amplification factor of the horn is m, m=D1 / D2,

[0028] D1 is the diameter of the cone, and D2 is the diameter of the rod;

[0029] The amplified amplitude is greater than 10 microns.

[0030] Optionally, the structural parameters of the resonant cavity, horn, nozzle and spray vane include:

[0031] The inner diameter and length of the resonant cavity, the cone diameter and rod diameter of the amplitude transformer, the water outlet diameter of the nozzle and the diameter of the spray blade.

[0032] Compared with the prior art, the above technical solution has at least the following beneficial effects:

[0033] It can combine the advantages of pulse jets, cavitation jets, and abrasive jets, integrating 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 properly matching the ultrasonic amplitude transformer, resonant cavity, and nozzle parameters, the jet can reach peak resonance under both active and passive dual excitation. At the same time, the mixing chamber draws in the abrasive slurry from the environment for primary mixing, and the abrasive jet is then ejected for a secondary mixing with the ambient abrasive slurry, achieving a dual mixing process of high-speed jet and abrasive. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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.

[0035] Figure 1 is a schematic cross-sectional view of the structure of the present invention;

[0036] Figure 2 A schematic diagram of the prior art of the spray blade of the present invention;

[0037] Figure 3 This is an exploded view from a first perspective of the present invention;

[0038] Figure 4 This is a structural diagram from the first perspective of the present invention;

[0039] Figure 5 This is an exploded view from a second perspective of the present invention;

[0040] Figure 6 This is a structural diagram from a second perspective of the present invention;

[0041] Figure 7 Schematic diagram of the erosion results of the pulsed cavitation abrasive jet nozzle based on the mixing chamber of the present invention in a submerged environment and under different working conditions.

[0042] Reference numerals:

[0043] 11. Amplitude transformer; 12. Resonant cavity; 13. Water inlet; 14. Spray vane; 20. Mixing cavity; 30. Upper cavity cover;

[0044] 11-1, rod; 11-2, frustum; 11-3, arc-shaped connecting part; 11-4, frustum. DETAILED DESCRIPTION

[0045] 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.

[0046] 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.

[0047] 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.

[0048] like Figures 1 to 6 As shown, the present invention applies active and passive dual excitation to the jet and constructs a dual-mixing structure of internal and external abrasive particles, synergistically utilizing the pulse jet water hammer effect, the cavitation jet cavitation ability and the jet abrasive cutting action, thereby significantly improving the jet erosion and crushing ability. The specific contents are as follows:

[0049] The present invention provides a pulsed cavitation abrasive jet nozzle based on a mixing chamber, comprising: a coaxially arranged resonant cavity 12, a horn 11, a spray piece 14 and an upper cavity cover 30; the horn 11 is installed in the resonant cavity 12, the horn 11 is arranged as an integral whole, and the upper cavity cover 30 is arranged at the top of the resonant cavity 12. When the horn 11 moves upward, the upper cavity cover 30 restricts the horn 11 from moving upward and separating from the resonant cavity 12; two water inlets 13 are arranged in the middle of the cavity body of the resonant cavity 12. The water inlet 13 is arranged at the bottom of the amplitude transformer 11, above the two water inlets 13 and adjacent to the two water inlets 13; a nozzle is arranged at the bottom of the resonance cavity 12, and the nozzle includes a nozzle head and an outer shell. The nozzle head is a cavitation type nozzle, and the spray piece 14 is arranged in the cavity inside the nozzle head; a mixing chamber 20 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 20 is connected with the inner cavity of the nozzle head, and the mixing chamber 20 is connected with the center of the spray piece 14.

[0050] In the present invention, the horn 11, the resonant cavity 12, the water inlet 13 and the spray blade 14 form a dual excitation assembly, and the water outlet is provided at the center of the spray blade 14. The water inlet 13 is connected to the resonant cavity 12 and the water outlet to form a water flow path.

[0051] The mixing chamber 20 is coaxially sleeved with the central water outlet of the spray blade 14 at its bottom end. An abrasive slurry inlet is provided on the outside of the mixing chamber 20, and the inlet is connected to the mixing chamber 20 body. The mixing chamber 20 is coaxially arranged with an outlet on the outside of the center of the spray blade 14, and the outlet is connected to the central water outlet of the coaxial spray blade 14 and the radial inlet of the mixing chamber 20 to form a water flow. The mixing chamber 20 is coaxial with the resonant cavity 12 and is located at the end outside the resonant cavity 12. The center of the nozzle spray blade 14 is connected to the outlet of the mixing chamber 20, and the upper chamber cover 30 is coaxially sleeved on the upper end outside the resonant cavity 12 and on the outside of the horn 11.

[0052] In a specific embodiment, the amplitude transformer 11 includes a frustum 11-4, a cone 11-2, an arc-shaped connecting portion 11-3 and a rod 11-1 coaxially arranged from top to bottom; the top surface radius of the frustum 11-4 is greater than the bottom surface radius of the frustum 11-4; the bottom surface of the frustum 11-4 is arranged on the upper surface of the cone 11-2, and the diameter of the cone 11-2 is greater than the diameter of the lower bottom surface under the upper cavity cover 30; the diameter of the rod 11-1 is smaller than the bottom surface diameter of the frustum 11-4; the top of the rod 11-1 is connected to the cone 11-2 through the arc-shaped connecting portion 11-3.

[0053] In a specific embodiment, the nozzle and the resonance cavity 12 are threadedly connected, the nozzle and / or the resonance cavity 12 support replacement, the spray piece 14 supports axial movement, the spray piece 14 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 20 is arranged on the shell.

[0054] The mixing chamber 20 and the spray piece 14 are relatively movable in the axial direction, so that the axial relative position of the mixing chamber 20 and the water outlet member of the mixing chamber 20 can be adjusted; and / or, the mixing chamber 20 and the spray piece 14 are detachably connected, so that either the mixing chamber 20 or the spray piece 14 can be replaced.

[0055] The resonant cavity 12 includes a connecting section at the central water outlet end of the spray plate 14; a through hole is provided in the center of the mixing cavity 20, the connecting section is sleeved in the through hole, and the connecting section and the through hole are connected by threaded fitting.

[0056] like Figure 2 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.

[0057] Under submerged environmental conditions, key fluid parameters that affect the fluid, such as water channel pressure and abrasive mixing flow rate, can be independently adjusted and optimized. In addition, the spray plate 14 of this structure is coupled with a mixing chamber 20, which is simple to operate, tightly connected, and has very high reliability. In addition, the dual-excitation component 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 20, 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 submerged conditions and lays the foundation for further improving the working efficiency of mixed cavitation jets under submerged conditions.

[0058] The dual-excitation component uses a self-excited oscillation pulse nozzle, which adds ultrasonic pulse excitation through the amplitude rod 11 and self-excited oscillation of the nozzle 14 to generate a dual-excitation cavitation jet. 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.

[0059] The mixing chamber 20 and the resonance chamber 12 are detachably connected, so that either of the mixing chamber 20 and the resonance chamber 12 can be replaced. This allows the axial relative position of the mixing chamber 20 and the spray vane 14 to be adjusted; and / or, the mixing chamber 20 and the spray vane 14 are detachably connected, so that either of the mixing chamber 20 and the outer nozzle can be replaced. The resonance chamber 12 body includes a connecting section at the central water outlet end of the spray vane 14; a through hole is provided in the center of the mixing chamber 20, the connecting section is sleeved in the through hole, and the connecting section and the through hole are connected by threaded fitting;

[0060] The specific connection method of the mixing chamber 20, the dual excitation component, and the upper chamber cover 30 is not limited thereto.

[0061] On the other hand, the present invention provides a method for adjusting a pulsed cavitation abrasive jet nozzle based on a mixing chamber. During operation, high-pressure water enters from the water inlet and is ejected through the nozzle blade below the resonant cavity. At the same time, the ultrasonic amplitude transformer applies active pulse excitation, and the jet pulse is fed back to the resonant cavity through the nozzle blade to generate passive excitation. The active and passive excitations are matched to form a dual excitation resonance. A mixing chamber is provided downstream of the nozzle blade. Abrasive particles are injected into the mixing chamber by a high-speed jet at low pressure, and are mixed with the pulsed cavitation jet inside the mixing chamber. After being fully accelerated, they are ejected from the mixing chamber outlet and mixed with the abrasive particles in the annihilation fluid for a second time below the nozzle, ultimately forming a pulsed cavitation abrasive jet based on dual excitation and dual mixing. The present invention applies active and passive dual excitation to the jet and constructs a dual mixing structure of internal and external abrasive particles, synergistically utilizing the pulsed jet water hammer effect, the cavitation jet cavitation ability and the jet abrasive cutting effect, thereby greatly improving the jet erosion and crushing ability.

[0062] The adjustment method includes the following steps:

[0063] S1. Adjust the structural parameters of the resonant cavity 12, horn 11, nozzle and nozzle 14 so that the active excitation and passive excitation frequency and phase match to achieve a peak resonance state; specifically including:

[0064] Before the external high-pressure water flow enters the resonant cavity 12, the structural parameters of the dual excitation component and the structural parameters of the mixing cavity 20 are adjusted, including the physical parameters of at least one of the water inlet 13, the resonant cavity 12, and the nozzle 14, and the physical parameters of at least one of the mixing cavity 20 and the water outlet.

[0065] S2. Connect the two water inlets 13 to a high-pressure water flow, so that the nozzle head is submerged and the nozzle head of the pulsed cavitation abrasive jet nozzle based on the mixing chamber is placed in operation. The pressure of the high-pressure water flow is greater than 10 MPa; specifically, the following steps are included:

[0066] Connecting the water inlet 13 to an external high-pressure water flow; adjusting the high-pressure water flow to adjust the fluid parameters of the cavitation nozzle device respectively;

[0067] 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.

[0068] When the two water inlets 13 are connected to high-pressure water flow, the amplitude transformer 11 amplifies the vibration amplitude.

[0069] The amplitude amplification coefficient of the amplitude transformer 11 is m, m=D1 / D2, D1 is the diameter of the cone 11-2, and D2 is the diameter of the rod 11-1; the amplified amplitude is greater than 10 microns.

[0070] The structural parameters of the resonant cavity 12, the horn 11, the nozzle and the nozzle 14 include:

[0071] The inner diameter and length of the resonant cavity 12 , the diameter of the truncated cone 11 - 2 and the diameter of the rod 11 - 1 of the horn 11 , the water outlet diameter of the nozzle and the diameter of the spray blade 14 .

[0072] In a specific embodiment, the structural parameters of the dual excitation component are adjusted by relatively moving the position of at least one of the mixing chambers 20 and the mixing chamber 20 that meets the predetermined structural parameter requirements along the axial direction.

[0073] In a specific embodiment, the structural parameters of the dual excitation component include at least one of the following: the diameter of the water inlet 13, the diameter of the resonance cavity 12, the diameter of the water outlet of the nozzle 14, the material of the nozzle 14, and the natural frequency of the amplitude rod 11.

[0074] In a specific embodiment, the structural parameters of the mixing chamber 20 include at least one of the following: the inner diameter of the mixing chamber 20 , the outer diameter of the abrasive inlet of the mixing chamber 20 , and the inner diameter of the water outlet of the mixing chamber 20 .

[0075] Figure 7 The erosion results of the pulsed cavitation abrasive jet nozzle device provided by the present invention under different working conditions of the submerged environment are shown in FIG. Figure 7 (a) shows the erosion result of cavitation jet without mixing cavity 20 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 7Middle (b) shows the erosion result of pulsed cavitation jet without mixing cavity 20 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 7 Middle (c) shows the erosion result of pulsed cavitation abrasive jet in the presence of mixing cavity 20 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 7 Middle (d) shows the erosion result of pulsed cavitation abrasive jet under the condition of mixing cavity 20 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.

[0076] 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 11, the resonant cavity 12, and the nozzle 14, the jet can reach a peak resonance state under active and passive dual excitation. At the same time, the mixing chamber 20 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.

[0077] The following points need to be explained:

[0078] (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.

[0079] (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.

[0080] (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.

[0081] 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 nozzle based on a mixing chamber, characterized in that: include: A resonant cavity, a horn, a spray nozzle and an upper cavity cover arranged coaxially; 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, above the two water inlets and adjacent to the two water inlets; A nozzle is provided at the bottom of the resonant cavity, the nozzle comprising a nozzle head and a shell, the nozzle head being a cavitation type nozzle, and the nozzle blade is provided in a cavity within 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. The mixing chamber is communicated with the inner cavity of the nozzle head and is communicated with the center of the spray piece. Based on the mixing chamber provided downstream of the spray plate, the abrasive particles are injected into the mixing chamber by the high-speed jet at low pressure, and are mixed with the pulsed cavitation jet inside the mixing chamber; the jet ejected from the mixing chamber outlet is mixed with the abrasive particles in the submerged fluid for a second time below the nozzle, completing double mixing.

2. The pulsed cavitation abrasive jet nozzle based on a mixing chamber 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 nozzle based on a mixing chamber according to claim 2, characterized in that: The nozzle and the resonant cavity are threadedly connected, and the nozzle and / or the resonant cavity can be replaced.

4. The pulsed cavitation abrasive jet nozzle based on a mixing chamber according to claim 3, characterized in that: The spray piece supports axial movement and supports disassembly.

5. The pulsed cavitation abrasive jet nozzle based on a mixing chamber according to claim 4, characterized in that: The shell contains the side wall of the nozzle head; The housing is threadedly connected to the nozzle head; The mixing chamber is arranged on the shell.

6. A method for adjusting a pulsed cavitation abrasive jet nozzle based on a mixing chamber, characterized in that: The pulsed cavitation abrasive jet nozzle based on the mixing chamber as claimed in any one of claims 1 to 5 comprises the following steps: Adjusting the structural parameters of the resonant cavity, horn, nozzle, and nozzle blades to match the frequency phases of active excitation and passive excitation to achieve a peak resonance state; Connecting the two water inlets to a high-pressure water flow so that the nozzle head is submerged, and placing the nozzle head of the pulsed cavitation abrasive jet nozzle based on the mixing chamber in operation; When the operation is in progress, high-pressure water enters from the water inlet and is ejected through the nozzle blade below the resonance cavity. At the same time, the ultrasonic amplitude transformer applies active pulse excitation, and the jet pulse is fed back to the resonance cavity through the nozzle blade to generate passive excitation. The active and passive excitations are matched to form a double excitation resonance. A mixing chamber is provided downstream of the nozzle blade. The abrasive particles are injected into the mixing chamber by the high-speed jet at low pressure. After being mixed with the pulsed cavitation jet inside the mixing chamber, they are ejected from the outlet of the mixing chamber and mixed with the abrasive particles in the annihilation fluid for a second time below the nozzle, forming a pulsed cavitation abrasive jet based on double excitation and double mixing.

7. The method for adjusting a pulsed cavitation abrasive jet nozzle based on a mixing chamber according to claim 6, characterized in that: The pressure of the high-pressure water flow is greater than 10 MPa.

8. The method for adjusting a pulsed cavitation abrasive jet nozzle based on a mixing chamber according to claim 7, characterized in that: When the two water inlets are connected to high-pressure water flow, the amplitude of the horn amplifies the vibration amplitude. The amplitude amplification factor of the horn is m, m=D1 / D2, D1 is the diameter of the cone, and D2 is the diameter of the rod; The amplified amplitude is greater than 10 microns.

9. The method for adjusting a pulsed cavitation abrasive jet nozzle based on a mixing chamber according to claim 8, characterized in that: The structural parameters of the resonant cavity, horn, nozzle and spray piece include: The inner diameter and length of the resonant cavity, the cone diameter and rod diameter of the amplitude transformer, the water outlet diameter of the nozzle and the diameter of the spray blade.

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