Self-oscillation cavitation jet device and high-frequency on-off flow calculation method
By designing a self-excited oscillating cavitation jet device, changing the nozzle structural parameters and cavity shape, so that the natural frequency of the system is close to the incoming flow disturbance frequency, the problem of unsatisfactory cleaning effect in the prior art is solved, and stronger impact force and cavitation cleaning effect are achieved.
Patent Information
- Application Number
- CN202411402910.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-09
- Publication Date
- 2025-02-28
AI Technical Summary
In the fields of ship cleaning, underwater building cleaning, petroleum exploration and chemical pipeline cleaning, it is difficult to effectively remove attachments on the surface of target targets.
A self-excited oscillation cavitation jet device is designed. By changing the structural parameters of the self-excited oscillation nozzle and the cavity length, cavity diameter, and collision wall shape of the self-excited oscillation cavity, the natural frequency of the nozzle system is close to the disturbance frequency of the nozzle inlet, thereby producing a more intense self-excited oscillation effect, enhancing the impact force of the jet and cavitation cleaning effect.
This device can produce a stronger impact force on the surface attachments of the target target. Through the generation and annihilation of cavitation bubbles, a local high-temperature and high-pressure shock wave is formed, and the attachments are further dismembered, achieving a more efficient cleaning effect.
Smart Images
Figure CN119525038A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of cleaning devices, and in particular to a self-excited oscillation cavitation jet device and a high-frequency on-off flow calculation method. Background Art
[0002] In the fields of ship cleaning, underwater buildings (platforms), oil exploration, chemical pipeline cleaning, etc., it is necessary to clean the attachments on the surface of the target object, and the cleaning effect of ordinary nozzle pressure flushing is not ideal. Summary of the invention
[0003] To this end, the present invention designs a self-excited oscillation cavitation jet device. The device adopts a self-excited oscillation cavitation jet method. Since the device has both the characteristics of a self-excited oscillation pulse jet and a cavitation jet, in order to improve its self-excited oscillation effect and enhance the cavitation effect at the same time, the main method is to change the structural parameters of the self-excited oscillation nozzle, the cavity length, cavity diameter, and shape of the collision wall of the self-excited oscillation cavity. When the system natural frequency of the self-excited oscillation nozzle is close to the disturbance frequency of the flow at the nozzle inlet, the nozzle will produce a more intense self-excited oscillation effect, thereby enhancing the impact force and cavitation cleaning effect of the jet, so that when it impacts the target object, it will have an intermittent water hammer pressure impact on the target surface, and produce a stronger impact force on the attachments on the target surface. At the same time, the self-excited oscillation pulse jet will induce the generation of cavitation bubbles. At the moment of bubble annihilation, a local high-temperature and high-pressure shock wave can be generated, which further dismembers the attachments on the surface of the target object to achieve a cleaning effect.
[0004] In order to realize the above-mentioned technical features, the purpose of the present invention is achieved as follows: a self-excited oscillation cavitation jet device includes a sealing device for supporting and sealing the entire device, a power device for providing power is fixedly installed inside the sealing device through a cantilever structure, the output end of the power device is connected to a rotating device for power transmission, and a high-frequency on-off device for controlling the on-off of water flow is installed at the output end of the rotating device.
[0005] Preferably, the sealing device comprises a lower shell and an upper shell which are split and symmetrically arranged, and the lower shell and the upper shell are locked and fixed by an ear plate in the middle; a left end cover and a right end cover are fixed to the left and right ends of the lower shell and the upper shell respectively.
[0006] Preferably, the power device comprises a motor, and the tail of the motor is fixed to the inner wall of the left end cover through a motor base.
[0007] Preferably, the rotating device includes a sleeve fixed at the end where the motor main shaft is located, the end of the sleeve is fixed with a bearing seat, the end of the bearing seat is fixedly installed with a bearing seat, the interior of the bearing seat is rotatably supported by a bearing with a rotating shaft, the rotating shaft is connected to the main shaft of the motor through a key, and the other end of the rotating shaft is connected to the high-frequency switching device.
[0008] Preferably, there are two groups of bearings, and thrust ball bearings are used, and the bearings are positioned by shoulders arranged on the rotating shaft.
[0009] Preferably, the high-frequency on-off device includes a high-frequency on-off rotor, which is fixed to the end of the rotating shaft by a round nut and connected by a key; the high-frequency on-off rotor cooperates with the notch on the water pipe, and the flow hole on the high-frequency on-off rotor cooperates with the water pipe. When the high-frequency on-off rotor rotates, intermittent on-off is formed with the water pipe, one end of the water pipe is fixed on the left end cover, and the other end of the water pipe passes through the right end cover and fixes the nozzle.
[0010] Preferably, the high-frequency switching rotor comprises a rotor, and the outer circle of the rotor is processed with evenly arranged flow holes.
[0011] Preferably, the water pipe is fixedly connected to the right end cover via a flange.
[0012] Preferably, the high-frequency on-off flow calculation method of the self-excited oscillation cavitation jet device is: The intervals between the flow holes are consistent, and the radius is r. The center angle of the interval is set to α. The distance between the center of the flow hole and the interval and the center of the rotor is R. The rotor shaft is connected to the motor shaft through a key. The motor drives the rotor of the high-frequency switching device to rotate at a high speed at an angular velocity ω. The diameter of the rotor flow hole and the inner diameter of the pipeline are both r. When the rotor rotates at a high speed, high-frequency switching is formed on the incoming flow, thereby providing a disturbance frequency consistent with the natural frequency of the nozzle system for the incoming flow at the nozzle inlet; The inlet part of the left end of the nozzle is connected to the outlet of the high-frequency switching device through the flange on the right end cover. The straight pipe section of the nozzle inlet is l1 long and has a diameter of d1; the straight pipe section of the nozzle outlet is l2 long and has a diameter of d2; the oscillation cavity is L0 long, has a diameter of D0, and has a wall thickness of S; If the number of flow holes on the rotor of the high-frequency switching device is Z, the radius is r, and the distance between the center of the circle and the center of the rotor is R, since the holes are arranged equidistantly and the radius of the spacing is the same as the radius of the flow hole, the central angle corresponding to each hole and the spacing is α , α= The center angle between two adjacent teeth is 2 α ; When the central axis of the rotor moves at an angular velocity ω , as the motor rotates, its angular displacement is , , with the orifice closed as the initial position; the rotor will make the fluid flow through the cross-sectional area S during the rotation process V Periodic changes occur when Gradually increases to α, at which time the angular displacement of the orifice is described as θ 1, gradually increasing to a maximum value of As α gradually increases to 2α, the angular displacement of the orifice is described as θ 2. The flow cross-sectional area gradually decreases to the minimum; therefore, the change period of the flow cross-sectional area through which the fluid passes is T=2α / ω; If the orifice is completely closed, the flow cross-sectional area S of the fluid passing through the high-frequency on-off device V =0 is the initial position, then when the rotation angle In the process of gradually increasing to α, a rectangular coordinate system is established with the rotor center as the origin, and the flow cross-sectional area of the orifice is calculated and derived as follows: Formulas (1-1) and (1-2) are respectively the equations for the interface between the orifice and the pipe diameter and the orifice circle in motion: (1-1); (1-2); Subtracting (1-2) from (1-1) yields: (1-3); In formula (1-3), let ; We can get: (1-4); (1-5); Substituting x into have to: (1-6); Similarly, substitute y into have to: (1-7); From (1-6), we can get: (1-8); From (1-7), we can get: (1-9); Let a= ; b = ; c = ; According to formula (1-7), we have: (1-10); (1-11); Let a1= ; b1 = ; c1 = From formula (1-9), we have: (1-12); (1-13); From (1-10)(1-11)(1-12)(1-13), we can get: The coordinates of the intersection of the two circles are: (1-14); (1-15); From equations (1-14) and (1-15), we can get the expression of the chord length of the intersection of two circles: (1-16); By calculation, we can get: (1-17); (1-18); From equations (1-16), (1-17), and (1-18), the final chord length expression can be obtained as: (1-19); If the centers of the two circles are O1 and O2, when the two circles intersect at points E and F, the cross-sectional area S V ; The length of EF is ; O1 The foot of the perpendicular line is G and the length is , then: (1-20); in: (1-21); (1-22); make , from formula (1-21) and (1-22) we have: (1-23); (1-24); From (1-21), (1-22), (1-23), (1-24), we can get: (1-25); (1-26); (1-27); When the rotation angle The calculation process of the flow cross-sectional area and the rotation angle in the process of gradually increasing from α to 2α The process of gradually increasing to α is the same; The equations of the two circles are: (1-28); (1-29); By order ; , (1-28) minus (1-29) gives: (1-30); (1-31); Similarly, substitute equations (1-30) and (1-31) into the equation of the orifice circle: get: (1-32); (1-33); In the above formula ; ; ; (1-34); (1-35); In the above formula ; ; ; Similarly, the chord length is: (1-36); Similarly, its flow cross-sectional area S V for: (1-37); So in summary, In the process of gradually increasing to 2α, the flow area expression of the fluid flowing through the orifice of the high-frequency switch is: (1-38); When the average flow rate of the fluid at the inlet of the high-frequency switch is V When , the flow rate expression of the fluid flowing through the orifice of the high-frequency switch can be obtained by formula (1-38): (1-39)
[0013] The present invention has the following beneficial effects: The device adopts the method of self-excited oscillation cavitation jet. Since it has the characteristics of self-excited oscillation pulse jet and cavitation jet at the same time, in order to improve its self-excited oscillation effect and enhance the cavitation effect at the same time, the main method is to change the structural parameters of the self-excited oscillation nozzle, the cavity length, cavity diameter and shape of the collision wall of the self-excited oscillation cavity. When the system natural frequency of the self-excited oscillation nozzle is close to the disturbance frequency of the flow at the nozzle inlet, the nozzle will produce a more intense self-excited oscillation effect, thereby enhancing the impact force and cavitation cleaning effect of the jet, so that when it impacts the target object, it will have an intermittent water hammer pressure impact on the target surface, and produce a stronger impact force on the attachments on the target surface. At the same time, the self-excited oscillation pulse jet will induce the generation of cavitation bubbles. At the moment of bubble annihilation, a local high-temperature and high-pressure shock wave can be generated, which further dismembers the attachments on the surface of the target object and achieves a cleaning effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0015] Figure 1 It is a three-dimensional diagram of the overall structure of the present invention from the first perspective.
[0016] Figure 2 This is a three-dimensional diagram of the overall structure of the present invention from a second viewing angle.
[0017] Figure 3 This is a three-dimensional image from a first perspective after the sealing device of the present invention is removed.
[0018] Figure 4 This is a three-dimensional image from a second perspective after the sealing device of the present invention is removed.
[0019] Figure 5 This is a three-dimensional image from a third viewing angle after the sealing device of the present invention is removed.
[0020] Figure 6 It is a side view of the present invention.
[0021] Figure 7 For the present invention Figure 6 Medium AA view.
[0022] Figure 8 This is a three-dimensional diagram of the power device and the rotating device of the present invention from the first perspective.
[0023] Fig. 9 This is a three-dimensional diagram from the second perspective of the power device and the rotating device of the present invention.
[0024] Fig.10 It is a parameter diagram of the high-frequency switching device of the present invention.
[0025] Fig.11 It is a two-dimensional cross-sectional schematic diagram of the nozzle of the present invention.
[0026] Fig.12 It is a schematic diagram of the flow cross-sectional area of the present invention.
[0027] Fig.13 It is a schematic diagram of calculating the flow cross-sectional area of the present invention.
[0028] In the figure: power device 1, rotating device 2, high-frequency switching device 3, sealing device 4; Motor 101, motor base 102; Rotating shaft 201, bearing 202, shaft sleeve 203, bearing seat 204, bearing seat 205, shaft shoulder 206; High frequency on-off rotor 301, water pipe 302, round nut 303, nozzle 304; Rotor 3001, flow hole 3002; Left end cover 401 , right end cover 402 , lower shell 403 , upper shell 404 , ear plate 405 . DETAILED DESCRIPTION
[0029] The embodiments of the present invention are further described below in conjunction with the accompanying drawings.
[0030] Embodiment 1: See also Figure 1-9 The self-excited oscillation cavitation jet device includes a sealing device 4 for supporting and sealing the entire device, a power device 1 for providing power is fixedly installed inside the sealing device 4 through a cantilever structure, the output end of the power device 1 is connected to a rotating device 2 for power transmission, and a high-frequency on-off device 3 for controlling the flow of water is installed at the output end of the rotating device 2. Through the above device, during the working process, the rotating device 2 is driven by the power device 1, and the high-frequency on-off device 3 is driven by the rotating device 2, thereby generating a self-excited oscillation effect, thereby enhancing the impact force of the jet and the cavitation cleaning effect.
[0031] Furthermore, the sealing device 4 comprises a lower shell 403 and an upper shell 404 which are arranged in a split and symmetrical manner, and the lower shell 403 and the upper shell 404 are locked and fixed by an ear plate 405 in the middle; a left end cover 401 and a right end cover 402 are fixed to the left and right ends of the lower shell 403 and the upper shell 404 respectively. The sealing device 4 can be used to effectively protect the internal structure thereof.
[0032] Furthermore, the power device 1 includes a motor 101, and the tail of the motor 101 is fixed to the inner wall of the left end cover 401 through a motor base 102. The power device 1 is used to provide power. During the working process, the motor 101 provides power.
[0033] Furthermore, the rotating device 2 includes a sleeve 203 fixed to the end where the main shaft of the motor 101 is located, a bearing seat 204 is fixed to the end of the sleeve 203, a bearing seat 205 is fixed to the end of the bearing seat 204, a rotating shaft 201 is rotatably supported inside the bearing seat 205 through a bearing 202, the rotating shaft 201 is connected to the main shaft of the motor 101 through a key, and the other end of the rotating shaft 201 is connected to the high-frequency switching device 3. The rotating device 2 can be used to transmit power. Then, the power is transmitted to the rotating device 2 through the power device 1, and the high-frequency switching device 3 is driven by the rotating device 2.
[0034] Furthermore, the bearing 202 is provided with two groups and adopts thrust ball bearings, and the bearing 202 is positioned by a shoulder 206 provided on the rotating shaft 201. A pair of thrust ball bearings are used through the above-mentioned bearings, and the rotating shaft is positioned through the shoulder on the shaft to support the rotating shaft, while preventing the axial movement and swaying of the rotating shaft, and balancing the axial force of the shaft. The shaft sleeve is positioned by the shoulder through the stepped shaft on the motor, and the radial and axial positioning of the motor is realized, which protects the motor and the rotating shaft. The bearing sleeve and the bearing seat also ensure the accurate operation of the rotating device by actually positioning the motor and the bearing radially and axially. The entire power unit is designed as a cantilever beam structure.
[0035] Furthermore, the high-frequency on-off device 3 includes a high-frequency on-off rotor 301, which is fixed to the end of the rotating shaft 201 by a round nut 303 and connected by a key; the high-frequency on-off rotor 301 cooperates with the notch on the water pipe 302, and the flow hole 3002 on the high-frequency on-off rotor 301 cooperates with the water pipe 302. When the high-frequency on-off rotor 301 rotates, it forms intermittent on-off with the water pipe 302. One end of the water pipe 302 is fixed on the left end cover 401, and the other end of the water pipe 302 passes through the right end cover 402 and fixes the nozzle 304. Through the above-mentioned high-frequency on-off device 3, when the high-frequency on-off rotor 301 rotates, it forms intermittent on-off with the water pipe. At the same time, a sealing strip is used for sealing. The left end of the high-frequency on-off rotor is connected to the rotating shaft by a key. Like the positioning of the motor and the rotating shaft, the shaft sleeve and the bearing sleeve are used for positioning, and the right end is positioned by a round nut 303. The right end of the water pipe is connected to the nozzle 304 and the right end cover respectively, and is connected through a flange 305.
[0036] Furthermore, the high-frequency switching rotor 301 comprises a rotor 3001 , and the outer circle of the rotor 3001 is processed with evenly arranged flow holes 3002 .
[0037] Furthermore, the water pipe 302 and the right end cover 402 are fixedly connected via a flange 305 .
[0038] Embodiment 2: See also Figure 10-13 , the high-frequency on-off flow calculation method of the self-excited oscillation cavitation jet device: The rotor in the high-frequency switching device, such as Fig.10 As shown, there are rotor 3001 and flow holes 3002. The intervals between the flow holes 3002 are consistent, and the radius is r. The center angle of the interval is set to α. The distance between the center of the flow hole and the interval and the center of the rotor 3001 is R. The rotating shaft of the rotor 3001 is connected to the rotating shaft of the motor through a key. The motor 101 drives the rotor 3001 of the high-frequency switching device 3 to rotate at a high speed at an angular velocity ω. The diameter of the flow hole of the rotor 3001 and the inner diameter of the pipeline are both r. See Figure 8 When the rotor 3001 rotates at high speed, it forms high-frequency switching on and off for the incoming flow, thereby providing a disturbance frequency consistent with the natural frequency of the nozzle system for the incoming flow at the inlet of the nozzle 304; See also Fig.11 : is a cross-sectional schematic diagram of the nozzle. The inlet portion of the left end of the nozzle 304 is connected to the outlet of the high-frequency switching device through the flange on the right end cover. The inlet straight pipe section of the nozzle 304 has a length of l1 and a diameter of d1; the outlet straight pipe section of the nozzle has a length of l2 and a diameter of d2; the oscillation cavity has a length of L0, a diameter of D0, and a wall thickness of S; If the number of flow holes on the rotor of the high-frequency switching device is Z, the radius is r, and the distance between the center of the circle and the center of the rotor is R, since the holes are arranged equidistantly and the radius of the spacing is the same as the radius of the flow hole, the central angle corresponding to each hole and the spacing is α , α= The center angle between two adjacent teeth is 2 α ; See Fig.12 , when the central axis of the rotor moves at an angular velocity ω , as the motor rotates, its angular displacement is , , with the orifice closed as the initial position; the rotor will make the fluid flow through the cross-sectional area S during the rotation process V Periodic changes occur when The flow area gradually increases to α, which is the green shaded part. At this time, the angular displacement of the orifice is described as θ 1, gradually increasing to a maximum value of As α gradually increases to 2α, the flow area is the blue shaded part, and the angular displacement of the orifice is described as θ 2. The flow cross-sectional area gradually decreases to the minimum. Therefore, the change period of the flow cross-sectional area through which the fluid passes is T=2α / ω.
[0039] Depend on Fig.12 It can be seen that if the orifice is completely closed, the flow cross-sectional area S of the fluid passing through the high-frequency on-off device is V =0 is the initial position, then when the rotation angle In the process of gradually increasing to α, a rectangular coordinate system is established with the rotor center as the origin, and the flow cross-sectional area of the orifice is calculated and derived as follows: Formulas (1-1) and (1-2) are respectively the equations for the interface between the orifice and the pipe diameter and the orifice circle in motion: (1-1); (1-2); Subtracting (1-2) from (1-1) yields: (1-3); In formula (1-3), let ; We can get: (1-4); (1-5); Substituting x into have to: (1-6); Similarly, substitute y into have to: (1-7); From (1-6), we can get: (1-8); From (1-7), we can get: (1-9); Let a= ; b = ; c = ; According to formula (1-7), we have: (1-10); (1-11); Let a1= ; b1 = ; c1 = From formula (1-9), we have: (1-12); (1-13); From (1-10)(1-11)(1-12)(1-13), we can get: The coordinates of the intersection of the two circles are: (1-14); (1-15); From equations (1-14) and (1-15), we can get the expression of the chord length of the intersection of two circles: (1-16); By calculation, we can get: (1-17); (1-18); From equations (1-16), (1-17), and (1-18), the final chord length expression can be obtained as: (1-19); like Fig.13 , if the centers of the two circles are O1 and O2; when the two circles intersect at points E and F, the flow cross-sectional area S V ; The length of EF is ; O1 The foot of the perpendicular line is G and the length is , then: (1-20); in: (1-21); (1-22); make , from formula (1-21) and (1-22) we have: (1-23); (1-24); From (1-21), (1-22), (1-23), (1-24), we can get: (1-25); (1-26); (1-27); When the rotation angle The calculation process of the flow cross-sectional area and the rotation angle in the process of gradually increasing from α to 2α The process of gradually increasing to α is the same; The equations of the two circles are: (1-28); (1-29); By order ; , (1-28) minus (1-29) gives: (1-30); (1-31); Similarly, substitute equations (1-30) and (1-31) into the equation of the orifice circle: get: (1-32); (1-33); In the above formula ; ; ; (1-34); (1-35); In the above formula ; ; ; Similarly, the chord length is: (1-36); Similarly, its flow cross-sectional area S V for: (1-37); So in summary, In the process of gradually increasing to 2α, the flow area expression of the fluid flowing through the orifice of the high-frequency switch is: (1-38); When the average flow rate of the fluid at the inlet of the high-frequency switch is V When , the flow rate expression of the fluid flowing through the orifice of the high-frequency switch can be obtained by formula (1-38): (1-39).
Claims
1. A self-excited oscillating cavitation jet device, characterized in that: The invention comprises a sealing device (4) for supporting and sealing the entire device, wherein a power device (1) for providing power is fixedly installed inside the sealing device (4) via a cantilever structure, wherein the output end of the power device (1) is connected to a rotating device (2) for power transmission, and a high-frequency on-off device (3) for controlling the on-off of water flow is installed at the output end of the rotating device (2).
2. The self-excited oscillation cavitation jet device according to claim 1, characterized in that: The sealing device (4) comprises a lower shell (403) and an upper shell (404) which are arranged in a split and symmetrical manner. The lower shell (403) and the upper shell (404) are locked and fixed by means of an ear plate (405) at a middle portion. A left end cover (401) and a right end cover (402) are fixed to the left and right ends of the lower shell (403) and the upper shell (404) respectively.
3. The self-excited oscillation cavitation jet device according to claim 2, characterized in that: The power device (1) comprises a motor (101), the tail of the motor (101) being fixed to the inner wall of the left end cover (401) via a motor base (102).
4. The self-excited oscillation cavitation jet device according to claim 3, characterized in that: The rotating device (2) comprises a shaft sleeve (203) fixed to the end of the main shaft of the motor (101); a bearing seat (204) is fixed to the end of the shaft sleeve (203); a bearing seat (205) is fixedly mounted to the end of the bearing seat (204); a rotating shaft (201) is rotatably supported inside the bearing seat (205) via a bearing (202); the rotating shaft (201) is connected to the main shaft of the motor (101) via a key; and the other end of the rotating shaft (201) is connected to the high-frequency switching device (3).
5. The self-excited oscillation cavitation jet device according to claim 4, characterized in that: The bearings (202) are provided in two groups and adopt thrust ball bearings. The bearings (202) are positioned by means of a shaft shoulder (206) arranged on the rotating shaft (201).
6. The self-excited oscillation cavitation jet device according to claim 3, characterized in that: The high-frequency on-off device (3) comprises a high-frequency on-off rotor (301), which is fixed to the end of the rotating shaft (201) via a round nut (303) and connected by a key; the high-frequency on-off rotor (301) matches with a notch on the water pipe (302), and the flow hole (3002) on the high-frequency on-off rotor (301) matches with the water pipe (302); when the high-frequency on-off rotor (301) rotates, intermittent on-off is formed with the water pipe (302); one end of the water pipe (302) is fixed to the left end cover (401), and the other end of the water pipe (302) passes through the right end cover (402) and is fixed to the nozzle (304).
7. The self-excited oscillation cavitation jet device according to claim 6, characterized in that: The high-frequency switching rotor (301) comprises a rotor (3001), and the outer circle of the rotor (3001) is processed with evenly arranged flow holes (3002).
8. The self-excited oscillation cavitation jet device according to claim 6, characterized in that: The water pipe (302) and the right end cover (402) are fixedly connected via a flange (305).
9. The high-frequency on-off flow calculation method of the self-excited oscillation cavitation jet device according to any one of claims 1 to 8, characterized in that: The intervals between the flow holes (3002) are consistent, and the radius is r. The center angle of the interval is set to α. The distance between the center of the flow hole and the interval and the center of the rotor (3001) is R. The rotating shaft of the rotor (3001) is connected to the rotating shaft of the motor via a key. The motor (101) drives the rotor (3001) of the high-frequency switching device (3) to rotate at a high speed at an angular velocity ω. The diameter of the flow hole of the rotor (3001) and the inner diameter of the pipeline are both r. When the rotor (3001) rotates at a high speed, high-frequency switching is formed on the incoming flow, thereby providing a disturbance frequency consistent with the natural frequency of the nozzle system for the incoming flow at the inlet of the nozzle (304); The inlet portion of the left end of the nozzle (304) is connected to the outlet of the high-frequency switching device through a flange on the right end cover; the straight pipe section of the nozzle (304) inlet has a length of l1 and a diameter of d1; the straight pipe section of the nozzle outlet has a length of l2 and a diameter of d2; the oscillation cavity has a length of L0, a diameter of D0, and a wall thickness of S; If the number of flow holes on the rotor of the high-frequency switching device is Z, the radius is r, and the distance between the center of the circle and the center of the rotor is R, since the holes are arranged equidistantly and the radius of the spacing is the same as the radius of the flow hole, the central angle corresponding to each hole and the spacing is α , α= The center angle between two adjacent teeth is 2 α ; When the central axis of the rotor moves at an angular velocity ω , as the motor rotates, its angular displacement is , , with the orifice closed as the initial position; The rotor rotates to make the fluid flow through the cross-sectional area S V Periodic changes occur when Gradually increases to α, at which time the angular displacement of the orifice is described as θ 1, gradually increasing to a maximum value of As α gradually increases to 2α, the angular displacement of the orifice is described as θ 2. The flow cross-sectional area gradually decreases to the minimum; therefore, the change period of the flow cross-sectional area through which the fluid passes is T=2α / ω; If the orifice is completely closed, the flow cross-sectional area S of the fluid passing through the high-frequency on-off device V =0 is the initial position, then when the rotation angle In the process of gradually increasing to α, a rectangular coordinate system is established with the rotor center as the origin, and the flow cross-sectional area of the orifice is calculated and derived as follows: Formulas (1-1) and (1-2) are respectively the equations for the interface between the orifice and the pipe diameter and the orifice circle during motion: （1-1）； （1-2）； Subtracting (1-2) from (1-1) yields: （1-3）； In formula (1-3), let ; We can get: （1-4）； （1-5）； Substituting x into have to: （1-6）； Similarly, substitute y into have to: （1-7）； From (1-6), we can get: （1-8）； From (1-7), we can get: （1-9）； Let a= ; b = ; c = ; According to formula (1-7), we have: （1-10）； （1-11）； Let a1= ; b1 = ; c1 = From formula (1-9), we have: （1-12）； （1-13）； From (1-10)(1-11)(1-12)(1-13), we can get: The coordinates of the intersection of the two circles are: （1-14）； （1-15）； From equations (1-14) and (1-15), we can get the expression of the chord length of the intersection of two circles: （1-16）； By calculation, we can get: （1-17）； （1-18）； From equations (1-16), (1-17), and (1-18), the final chord length expression can be obtained as: （1-19）； If the centers of the two circles are O1 and O2, when the two circles intersect at points E and F, the cross-sectional area S V ; The length of EF is ; O1 The foot of the perpendicular line is G and the length is , then: （1-20）； in: （1-21）； （1-22）； make , from formula (1-21) and (1-22) we have: （1-23）； （1-24）； From (1-21), (1-22), (1-23), (1-24), we can get: （1-25）； （1-26）； （1-27）； When the rotation angle The calculation process of the flow cross-sectional area and the rotation angle in the process of gradually increasing from α to 2α The process of gradually increasing to α is the same; The equations of the two circles are: （1-28）； （1-29）； By order ; , (1-28) minus (1-29) gives: （1-30）； （1-31）； Similarly, substitute equations (1-30) and (1-31) into the equation of the orifice circle: get: （1-32）； （1-33）； In the above formula ; ; ; （1-34）； （1-35）； In the above formula ; ; ; Similarly, the chord length is: （1-36）； Similarly, its flow cross-sectional area S V for: （1-37）； So in summary, In the process of gradually increasing to 2α, the flow area expression of the fluid flowing through the orifice of the high-frequency switch is: （1-38）； When the average flow rate of the fluid at the inlet of the high-frequency switch is V When , the flow rate expression of the fluid flowing through the orifice of the high-frequency switch can be obtained by formula (1-38): （1-39）。