A novel vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device

Abstract

The present invention relates to a novel vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device. The occurrence of hub vortices can be monitored and judged through a real-time pressure sensor. A plurality of diversion pipes arranged on the surface of the water guide cone are dynamically controlled by an electromagnet, so that the tail of the arc-shaped diversion pipe enters the edge of the low-pressure area of the hub vortex. The water flow is accelerated by means of the pressure difference between the head and the tail of the arc-shaped diversion pipe to form a high-speed water flow to disperse the hub vortex. On the other hand, the arc-shaped diversion pipe makes the internal water body carry vorticity opposite to the rotation of the hub vortex, further disintegrating the internal structure of the hub vortex. Thereby effectively suppressing the occurrence and evolution of the hub vortex, improving the stability of the tail flow field of the water jet propulsion pump device, and ensuring the propulsion efficiency and stable operation of the pump device.

Description

Technical Field

[0001] The present invention relates to a novel vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device, belonging to the technical fields of ship engineering and water conservancy engineering. Background Art

[0002] A water jet propulsion pump device is a power device that uses the reaction force of water flow to push a ship forward. Because of its characteristics such as high efficiency, low vibration and noise, and strong anti-cavitation ability, it is widely used in naval ships and civilian ships. However, due to its short impeller and complex flow field, the water jet propulsion pump device is extremely prone to generate vortices during operation, and these vortices are mainly distributed at the impeller gap and the tip region of the guide cone of the pump device. Among them, the hub vortex is an important part of the wake vortex structure of the water jet propulsion pump device and is also the region where the wake vortex energy is relatively concentrated. The development and evolution of the hub vortex will cause hazards such as energy loss of the water jet propulsion pump device and generation of flow-induced noise, which will in turn have an adverse impact on the operation efficiency of the water jet propulsion device and the safe and stable navigation of the ship.

[0003] In order to effectively suppress the generation of the hub vortex of the pump device, improve the propulsion efficiency of the pump device, and ensure the quiet and stable operation of the ship. Many scholars have carried out relevant research and inventions on the vortex elimination measures of the pump device, and there are currently relevant patent designs for relevant measures. The authorized invention patent EP3150482A1 discloses a composite propeller cap structure for suppressing hub vortices. This composite propeller cap structure is coupled to the end of a convergent propeller cap to reduce the hub vortex cavitation generated after the propeller, and can additionally reduce the hub vortex cavitation by means of guide vanes attached between the convergent section or between the convergent section and the divergent section of the propeller cap. The authorized invention patent KR2020200002451U discloses a hub vortex controller behind a ship propeller. The present invention aims to reduce the vortices occurring in the hub of the ship propeller. This structure can be used to control the hub vortex, improve problems such as cavitation, noise, and vibration in the pump, and recover the propulsion force lost due to the hub vortex.

[0004] However, at present, there are few existing patents on the vortex elimination method for the hub vortex of the water jet propulsion pump. There are relatively more patents on the vortex elimination and energy recovery of the hub vortex behind the ship propeller, but there is no relevant patent disclosure on adding vortex elimination measures to the tail of the water jet pump device and achieving dynamic vortex elimination. Summary of the Invention

[0005] The purpose of the present invention is to provide a novel vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device in view of the deficiencies of the above-mentioned existing optimized design of the inlet flow passage.

[0006] The object of the present invention is achieved in the following way. A new vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device, including a water jet propulsion pump body, a water inlet channel, and a driving motor. One end of the water jet propulsion pump body is provided with a water inlet communicating with the water inlet channel, and the other end is provided with a nozzle outlet. The pump shaft of the driving motor extends into the water jet propulsion pump body, and one end of the pump shaft of the driving motor placed inside the water jet propulsion pump body is provided with an impeller section. A guide vane section is fixed inside the water jet propulsion pump body, and one end of the guide vane section faces the nozzle outlet, and the other end faces the impeller section. A number of guide vane blades are provided on the guide vane section. A water guide cone is provided at the front end of the guide vane section facing the nozzle outlet, and the water guide cone is located at the central position of the front end of the guide vane section facing the nozzle outlet. Start the driving motor, the rotation of the pump shaft of the driving motor drives the impeller section to rotate, and water is sequentially ejected from the nozzle outlet through the water inlet channel, the water jet propulsion pump body, and the water guide cone.

[0007] It is characterized in that:

[0008] Let the diameter of the nozzle outlet be D , in the area 0.6 D away from the tip of the water guide cone, a number of columns of pressure sensors are evenly arranged circumferentially along the center of the water guide cone. Several rows of pressure sensors are placed at equal intervals in each column for densely monitoring the pressure change at the front end of the water guide cone, so as to accurately judge whether a hub vortex is formed, the range and position of the hub vortex occurrence.

[0009] A number of guide pipe tracks are arranged on the surface of the water guide cone. Each guide pipe track is provided with a guide pipe that can slide in the guide pipe track. When the real-time pressure sensor monitors an abnormal pressure area, the tail of the guide pipe moves along the guide pipe track to the edge position of the hub vortex, and the water flow at the end of the guide vane is collected and accelerated by means of the pressure difference on both sides of the head and tail of the guide pipe, and the hub vortex is dispersed by means of the kinetic energy of the high-speed water flow. At the same time, the guide pipe has a curvature, so that the ejected water flow has a circulation opposite to that of the hub vortex, thereby destroying the internal structure of the hub vortex and causing it to collapse.

[0010] The cross-section of the guide pipe is circular arc-shaped, with a width of 0.08 D , a height of 0.1 D , and a length of 0.6 D ; A sliding component is slidably connected in the guide pipe track. A connecting section is provided at the lower part of the guide pipe, and the guide pipe is connected to the sliding component through the connecting section.

[0011] The length of the sliding component is 0.25 D， Four rows of sliding rollers are arranged on both sides of it to reduce sliding friction during operation.

[0012] The guide pipe track is a concave track, and the track length is 0.8 D, a rubber film is provided on the surface of the track to avoid the influence of the track on the flow field at the position of the water guide cone. At the same time, the track is set to be arc-shaped to ensure the same curvature everywhere for the smooth sliding of the guide pipe.

[0013] To dynamically control the guide pipe on the surface of the water guide cone so that it can accurately and timely disperse the hub vortex structure; an electromagnet is provided at one end of the guide pipe track far from the nozzle outlet, and an electromagnetic coil for controlling the magnetic strength of the electromagnet is provided near the electromagnet. At the same time, a strong magnet is provided at the other end of the guide pipe track;

[0014] A spring is provided in the guide pipe track. One end of the spring is connected to the sliding component, and the other end is connected to the strong magnet; the electric quantity of the electromagnetic coil near the electromagnet is controlled through real-time pressure data, and then the tail of the guide pipe is slid to the edge of the hub vortex;

[0015] A signal feedback device, an electromagnet controller, a pressure sensor, the signal feedback device, the electromagnet controller, and the electromagnetic coil are connected in sequence; the pressure change at the position of the water guide cone is detected by the pressure sensor to infer the area and specific position where the hub vortex occurs, and the relevant data is transmitted into the electromagnet controller through the signal feedback device, and the electromagnet controller is used to push the guide pipe so that the tail of the guide pipe slides into the hub vortex edge area;

[0016] When the pressure sensor determines that there is no abnormal pressure phenomenon, the electromagnetic coil is not powered on, and the sliding component makes the guide pipe in the initial position due to the spring; when there is an abnormal pressure change, the electromagnetic coil starts to be powered on, and the electromagnet starts to generate a magnetic force opposite to that of the strong magnet, pushing the sliding component to move along the guide pipe track towards the strong magnet direction, driving the guide pipe to move towards the hub vortex part, and thus realizing the dynamic vortex elimination of the hub vortex of the water jet propulsion pump device.

[0017] The method of the present invention is advanced and scientific. The present invention aims at: the stability of the tail flow field of the water jet propulsion pump device is closely related to its propulsion efficiency and operation stability. However, during the high-speed driving of the ship in a complex water environment, vortex structures will inevitably be generated in its tail flow field. And due to the spatial non-uniformity and time instability of the fluid inside the pump device, obvious vortex structures often occur at the tip and tail regions of the water guide cone of the pump device, which will affect the propulsion efficiency of the pump device and also cause adverse vibrations of the unit to generate noise. However, since the water jet propulsion pump device mainly relies on the reaction force of the high-speed water flow at its tail as its power source, common measures such as grating bars and vortex elimination beams are difficult to be used here because they will affect the flow area of the water outlet passage of the pump device.

[0018] Through the present invention, in order to effectively suppress the occurrence of hub vortices at the position of the guide cone of the water jet propulsion pump device, avoid the influence of the evolution of the vortex structure on the stability of the flow pattern in the tail flow field, and further cause adverse effects on the stable operation and quiet navigation of the water jet propulsion pump device. The present invention arranges a guide pipe track and a pressure sensor at the position of the guide cone of the water jet propulsion pump device. By detecting the pressure change at the position of the guide cone through the pressure sensor, the area and specific position where the hub vortex occurs are inferred, and the relevant data are transmitted into the electromagnet controller through the signal feedback device, and the guide water channel is pushed by the electromagnet controller, so that the tail of the guide pipe slides into the edge area of the hub vortex. Since the hub vortex occurs concomitantly with cavitation, the pressure in the hub vortex area decreases sharply. Therefore, there is a large pressure difference between the head and tail areas of the guide pipe. Under the action of the pressure difference, the high-speed water flow at the outlet position of the guide vane is accelerated again. At the same time, since the guide pipe is made of an arc-shaped steel pipe, the outlet water flow has a certain circulation opposite to the hub vortex. These high-speed and circulating water flows are injected into the hub vortex area to disperse the hub vortex structure, thereby effectively suppressing the further evolution of the hub vortex and improving the propulsion efficiency of the pump device. The specific setting method is as follows:

[0019] Since the formation of the hub vortex will cause cavitation to occur, and then a relatively obvious negative pressure area appears at the tip of the guide cone (such as Figure 1 ). Therefore, by real-time monitoring of the pressure change at the tip of the guide cone, it can be judged whether the hub vortex occurs, and the densely arranged pressure sensors can specifically judge the edge of the hub vortex area, thereby providing data support for subsequent economical and effective dynamic vortex elimination. The specific setting method is to evenly arrange 7 columns of pressure sensors along the circumferential direction of the center of the guide cone in the area of 0.6 D of the tip of the guide cone of the water jet propulsion pump device. Each column is equidistantly placed with 5 rows of sensors to densely monitor the pressure change at the front end of the guide cone, so as to accurately judge whether the hub vortex is formed, the range and position where the hub vortex occurs (such as Figure 3 ).

[0020] In order to effectively suppress the formation of the hub vortex, improve the tail flow field, and improve the propulsion efficiency of the water jet propulsion pump device. A slidable guide pipe can be arranged on the surface of the guide cone. When the real-time pressure sensor monitors the pressure abnormal area, the tail of the guide pipe can move to the edge position of the hub vortex, and the water flow at the end of the guide vane is collected and accelerated by means of the pressure difference on both sides of the head and tail of the guide pipe, and the hub vortex is dispersed by means of the kinetic energy of the high-speed water flow. At the same time, the guide pipe has a certain arc, so that the ejected water flow has a circulation opposite to the hub vortex, thereby destroying the internal structure of the hub vortex and making it collapse (such as Figure 3 ). The cross-section of the guide pipe is circular arc-shaped, its width is 0.08 D , the height is 0.1 D , the length is 0.6 D , the lower part of the guide pipe is connected to the sliding part through a connecting section, and the length of the sliding part is 0.25 D Four rows of sliding rollers are respectively arranged on both sides of it to reduce sliding friction during operation (such asFigure 4 ). A concave track is arranged at the lower part of the draft tube, and the track length is 0.8 D . A rubber film is arranged on the track surface to avoid the influence of the track on the flow field at the position of the water guide cone. The track is set as an arc shape to ensure the same curvature everywhere so as to make the sliding of the draft tube smooth.

[0021] For dynamically controlling the draft tubes on the surface of the water guide cone so that it can accurately and timely disperse the hub vortex structure. An electromagnet is arranged at one end of the draft tube track far from the nozzle outlet, and an electromagnetic coil for controlling the magnetic size of the electromagnet is arranged near the electromagnet. At the same time, a strong magnet is arranged at the other end of the draft tube track at the head position of the sliding part of the draft tube;

[0022] When the pressure sensor judges that there is no abnormal pressure phenomenon, the electromagnetic coil is not energized, and the sliding part makes the draft tube in the initial position due to the spring; when there is an abnormal pressure change, the electromagnetic coil starts to be energized, and the electromagnet starts to generate a magnetic force opposite to that of the strong magnet, pushing the sliding part to move along the draft tube track towards the direction of the strong magnet, driving the draft tube to move towards the hub vortex part, and then realizing the dynamic vortex elimination for the hub vortex of the water jet propulsion pump device.

[0023] Beneficial effects: Through the present invention, the occurrence of the hub vortex can be monitored and judged by the real-time pressure sensor, and a plurality of draft tubes arranged on the surface of the water guide cone can be dynamically controlled by the electromagnet, so that the tail of the arc-shaped draft tube enters the edge of the low-pressure area of the hub vortex. With the help of the pressure difference between the head and the tail of the arc-shaped draft tube, the water flow is accelerated to form a high-speed water flow to disperse the hub vortex. On the other hand, the arc-shaped draft tube makes the internal water body carry vorticity opposite to the rotation of the hub vortex, further disintegrating the internal structure of the hub vortex. Thus, the occurrence and evolution of the hub vortex can be effectively inhibited, the stability of the tail flow field of the water jet propulsion pump device can be improved, and the propulsion efficiency and operation stability of the pump device can be ensured.

[0024] With the wide application of water jet propulsion technology in high-performance ships and military ships, the adoption of the present invention can effectively inhibit the occurrence of the hub vortex in the wake flow field of the water jet propulsion pump device, improve the propulsion efficiency of the pump device, and ensure the operation safety of the ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the hub vortex in the numerical simulation of the tail flow field of the water jet propulsion pump;

[0026] Figure 2 It is a schematic diagram of the internal structure of the water jet propulsion pump;

[0027] Figure 3 It is the layout diagram of the vortex elimination device at the water guide cone ( Figure 2 in the A-A direction);

[0028] Figure 4 It is the layout diagram of the pressure sensor;

[0029] Figure 5 Cross-sectional view of the vortex-eliminating and flow-guiding device ( Figure 3 in the direction of B-B in the figure);

[0030] In the figure: 1 water jet propulsion pump body, 2 water inlet channel, 3 drive motor, 4 nozzle outlet, 5 guide vane blade, 6 guide vane section, 7 water guide cone, 8 impeller section, 9 pressure sensor, 10 guide pipe track, 11 guide pipe, 12 sliding component, 13 electromagnet, 14 hub vortex, 15 sliding roller. Specific implementation manner

[0031] The present invention will be further described below in conjunction with the specific implementation manner.

[0032] A novel vortex-eliminating method by means of high-speed water flow inside a water jet propulsion pump device, including a water jet propulsion pump body 1, a water inlet channel 2, and a drive motor 3. One end of the water jet propulsion pump body 1 is provided with a water inlet that communicates with the water inlet channel 2, and the other end is provided with a nozzle outlet 4; the pump shaft of the drive motor 3 extends into the water jet propulsion pump body 1, and an impeller section 8 is provided at one end of the pump shaft of the drive motor 3 placed inside the water jet propulsion pump body 1. A guide vane section 6 is fixed inside the water jet propulsion pump body 1, and one end of the guide vane section 6 faces the nozzle outlet 4, and the other end faces the impeller section 8; a number of guide vane blades 5 are provided on the guide vane section 6; a water guide cone 7 is provided at the front end of the guide vane section 6 facing the nozzle outlet 4, and the water guide cone 7 is located at the central position of the front end of the guide vane section 6 facing the nozzle outlet 4; when the drive motor 3 is started, the rotation of the pump shaft of the drive motor 3 drives the impeller section 8 to rotate, and water is sequentially ejected from the nozzle outlet 4 through the water inlet channel 2, the water jet propulsion pump body 1, and the water guide cone 7.

[0033] Let the diameter of the nozzle outlet 4 be D , that is D is the outlet section diameter of the nozzle outlet. In the area 0.6 D from the tip of the water guide cone 7, a number of columns of pressure sensors 9 are evenly arranged circumferentially along the center of the water guide cone 7. A number of rows of pressure sensors 9 are placed at equal intervals in each column to densely monitor the pressure change situation at the front end of the water guide cone 7, so as to accurately judge whether the hub vortex 14 is formed, as well as the occurrence range and position of the hub vortex 14;

[0034] A number of guide pipe tracks 10 are arranged on the surface of the water guide cone 7, and a guide pipe 11 that can slide in the guide pipe track 10 is arranged in each guide pipe track 10. When the real-time pressure sensor 9 monitors an abnormal pressure area, the tail of the guide pipe 11 moves along the guide pipe track to the edge position of the hub vortex, and the water flow at the end of the guide vane blade 5 is collected and accelerated by means of the pressure difference on both sides of the head and tail of the guide pipe 11, and the hub vortex is dispersed by means of the kinetic energy of the high-speed water flow; at the same time, the guide pipe 11 has a curvature, so that the ejected water flow has a circulation opposite to that of the hub vortex, thereby destroying the internal structure of the hub vortex and making it collapse.

[0035] Further, the cross-section of the diversion pipe 11 is circular arc-shaped, with a width of 0.08 D and a height of 0.1 D and a length of 0.6 D ; A sliding component 12 is slidably connected in the diversion pipe track 10. A connecting section is provided at the lower part of the diversion pipe 11, and the diversion pipe 11 is connected to the sliding component 12 through the connecting section.

[0036] The length of the sliding component 12 is 0.25 D， Four rows of sliding rollers 15 are arranged on both sides of it to reduce sliding friction during operation; the diversion pipe track 10 is a concave track, and the track length is 0.8 D A rubber film is provided on the track surface to avoid the influence of the track on the flow field at the position of the water guide cone 7. At the same time, the track is circular arc-shaped to ensure the same curvature everywhere for the smooth sliding of the diversion pipe 11.

[0037] To dynamically control the diversion pipe 11 on the surface of the water guide cone 7 so that it can accurately and timely disperse the hub vortex 14 structure; an electromagnet 13 is provided at one end of the diversion pipe track 10 far from the nozzle outlet 4, and an electromagnetic coil for controlling the magnitude of the electromagnet's magnetic field is provided near the electromagnet 13. At the same time, a strong magnet is provided at the other end of the diversion pipe track 10.

[0038] A spring is provided in the diversion pipe track 10. One end of the spring is connected to the sliding component, and the other end is connected to the strong magnet; the power of the electromagnetic coil near the electromagnet is controlled by real-time pressure data, and then the tail of the diversion pipe 11 is slid to the edge of the hub vortex.

[0039] A signal feedback device and an electromagnet controller are also provided. The pressure sensor 9, the signal feedback device, the electromagnet controller, and the electromagnetic coil are connected in sequence; the pressure change at the position of the water guide cone 7 is detected by the pressure sensor 9 to infer the area and specific position where the hub vortex occurs, and the relevant data is transmitted into the electromagnet controller through the signal feedback device. The diversion pipe is pushed by the electromagnet controller to make the tail of the diversion pipe 11 slide into the hub vortex edge area.

[0040] When the pressure sensor 9 determines that there is no abnormal pressure phenomenon, the electromagnetic coil is not energized, and the sliding component 12 makes the diversion pipe 11 in the initial position due to the spring; when there is an abnormal pressure change, the electromagnetic coil starts to be energized, and the electromagnet 13 starts to generate a magnetic field opposite to that of the strong magnet, pushing the sliding component 12 to move along the diversion pipe track 10 towards the strong magnet direction, driving the diversion pipe 11 to move towards the hub vortex part, thereby realizing the dynamic vortex elimination of the hub vortex of the water jet propulsion pump device.

Claims

1. A novel vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device, comprising a water jet propulsion pump body (1), a water inlet passage (2), and a driving motor (3). One end of the water jet propulsion pump body (1) is provided with a water inlet communicating with the water inlet passage (2), and the other end is provided with a nozzle outlet (4). The pump shaft of the driving motor (3) extends into the water jet propulsion pump body (1), and an impeller section (8) is provided at one end of the pump shaft of the driving motor (3) placed inside the water jet propulsion pump body (1). A guide vane section (6) is fixed inside the water jet propulsion pump body (1), and one end of the guide vane section (6) faces the nozzle outlet (4), and the other end faces the impeller section (8). A number of guide vane blades (5) are provided on the guide vane section (6). A water guide cone (7) is provided at the front end of the guide vane section (6) facing the nozzle outlet (4), and the water guide cone (7) is located at the central position of the front end of the guide vane section (6) facing the nozzle outlet (4). Start the driving motor (3), the rotation of the pump shaft of the driving motor (3) drives the impeller section (8) to rotate, and water is sprayed out from the nozzle outlet (4) successively through the water inlet passage (2), the water jet propulsion pump body (1), and the water guide cone (7). It is characterized in that: Set The diameter of the nozzle outlet (4) is D , and several columns of pressure sensors (9) are evenly arranged circumferentially along the center of the water guide cone (7) within the area 0.6 D from the tip of the water guide cone (7). Several rows of pressure sensors (9) are placed at equal intervals in each column to densely monitor the pressure change at the front end of the water guide cone (7), thereby accurately judging whether the hub vortex (14) is formed, the occurrence range and position of the hub vortex (14); A number of guide pipe tracks (10) are arranged on the surface of the water guide cone (7). Each guide pipe track (10) is provided with a guide pipe (11) that can slide inside the guide pipe track (10). When the real-time pressure sensor (9) detects a pressure abnormal area, the tail of the guide pipe (11) moves along the guide pipe track to the edge position of the hub vortex, and the water flow at the end of the guide vane blade (5) is collected and accelerated by means of the pressure difference on both sides of the head and tail of the guide pipe (11), and the hub vortex is dispersed by means of the kinetic energy of the high-speed water flow. At the same time, the guide pipe (11) has a curvature, so that the sprayed water flow has a circulation opposite to that of the hub vortex, thereby destroying the internal structure of the hub vortex and causing it to collapse.

2. A novel vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device according to claim 1, characterized in that: The cross-section of the diversion pipe (11) is arc-shaped, with a width of 0.08 D , a height of 0.1 D , and a length of 0.6 D ; A sliding member (12) is slidably connected within the diversion pipe track (10). A connecting section is provided at the lower part of the diversion pipe (11), and the diversion pipe (11) is connected to the sliding member (12) through the connecting section; The sliding member (12) has a length of 0.25 D， On both sides thereof, four rows of sliding rollers (15) are respectively arranged to reduce sliding friction during operation; The diversion tube track (10) is a concave track with a track length of 0.8 D , and a rubber film is provided on the track surface to avoid the influence of the track on the flow field at the position of the water guide cone (7). At the same time, the track is set to be circular arc-shaped to ensure the same curvature everywhere so as to ensure the smooth sliding of the diversion tube (11).

3. A novel vortex elimination method by means of high-speed water flow inside a water jet propulsion pump device according to claim 2, characterized in that: To dynamically control the guide pipe (11) on the surface of the water guide cone (7) so that it can accurately and timely disperse the structure of the hub vortex (14); an electromagnet (13) is provided at one end of the guide pipe track (10) away from the nozzle outlet (4), and an electromagnetic coil for controlling the magnitude of the magnetism of the electromagnet is provided near the electromagnet (13). At the same time, a strong magnet is provided at the other end of the guide pipe track (10). A spring is provided inside the guide pipe track (10). One end of the spring is connected to a sliding component, and the other end is connected to the strong magnet. The electric quantity of the electromagnetic coil near the electromagnet is controlled by the real-time pressure data, and then the tail of the guide pipe (11) slides to the edge of the hub vortex. A signal feedback device and an electromagnet controller are also provided. The pressure sensor (9), the signal feedback device, the electromagnet controller, and the electromagnetic coil are connected in sequence. The pressure change at the position of the water guide cone (7) is detected by the pressure sensor (9) to infer the area and specific position where the hub vortex occurs, and the relevant data are transmitted into the electromagnet controller by means of the signal feedback device, and the guide pipe is pushed by means of the electromagnet controller, so that the tail of the guide pipe (11) slides into the edge area of the hub vortex. When the pressure sensor (9) determines that there is no abnormal pressure phenomenon, the electromagnetic coil is not energized, and the sliding member (12) keeps the diversion pipe (11) in the initial position due to the spring; when there is an abnormal pressure change, the electromagnetic coil starts to be energized, and the electromagnet (13) starts to generate a magnetic force opposite to that of the strong magnet, pushing the sliding member (12) to move along the diversion pipe track (10) towards the strong magnet, driving the diversion pipe (11) to move towards the hub vortex part, thereby realizing the dynamic vortex elimination for the hub vortex of the water jet propulsion pump device.

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