Axial flow water jet thruster and use method therefor

Abstract

An axial flow water jet thruster and a use method therefor. The axial flow water jet thruster comprises a pump housing (1), a guide vane (2), a pump shaft (3), an impeller (4), and an adjustment assembly (5). The guide vane (2) is fixedly disposed in the pump housing (1). The pump shaft (3) can rotate around its own axis, and one end of the pump shaft (3) extends into the pump housing (1). The impeller (4) is disposed in the pump housing (1); one end of the pump shaft (3) movably passes through the guide vane (2), and has a transmission connection with the impeller (4); and the pump shaft (3) can drive the impeller (4) to rotate. The adjustment assembly (5) is disposed in the pump housing (1), and the adjustment assembly (5) is connected to the impeller (4) and can drive the impeller (4) to move toward or away from the guide vane (2). The distance between the impeller (4) and the guide vane (2) can be promptly and conveniently adjusted, and the distance between the impeller (4) and the guide vane (2) can conform to the use environment without disassembling the axial flow water jet thruster, thereby avoiding the generation of turbulence, reducing vibration and noise, and causing the axial flow water jet thruster to have better adaptability and higher working efficiency.

Description

Axial-flow waterjet propulsion and its application

[0001] This application claims priority to Chinese Patent Application No. 202411741598.X, filed with the Chinese Patent Office on November 29, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of suction device technology, such as an axial-flow water jet propulsion device and its usage method. Background Technology

[0003] An axial-flow waterjet propulsion pump is a pump that uses the force generated by the blades of a rotating impeller to propel the liquid along its axis. The impeller of an axial-flow waterjet propulsion pump is equipped with blades and rotates within a cylindrical pump body. Fixed guide vanes are mounted on the pump casing above the impeller to eliminate the rotational motion of the liquid, converting it into axial motion and transforming the kinetic energy of the rotational motion into pressure energy.

[0004] When an axial-flow waterjet propulsion system is in operation, if the distance between the impeller and the guide vanes does not match the actual working environment, turbulence can easily form at the blade outlet. The impact of this turbulence on the guide vane inlet will reduce pump efficiency and exacerbate unit vibrations and noise.

[0005] In conventional axial-flow waterjet propulsion systems, the distance between the impeller and guide vanes is fixed after installation. To avoid turbulence in the axial-flow waterjet propulsion system when it is used in different working scenarios, it is necessary to replace the axial-flow waterjet propulsion system with one with a different impeller-to-guide vane distance according to the actual working scenario, or to disassemble the axial-flow waterjet propulsion system, adjust the impeller-to-guide vane distance, and then reassemble it. This is very inconvenient and seriously affects work efficiency.

[0006] Therefore, there is an urgent need for an axial-flow waterjet propulsion device and its usage method to solve the above problems. Summary of the Invention

[0007] The purpose of this application is to provide an axial-flow water jet propulsion device and its usage method, so as to solve the technical problem in the related art that the axial-flow water jet propulsion device cannot be well adapted to different working conditions, and to achieve the technical effect of improving work efficiency.

[0008] Based on the above concept, the technical solution adopted in this application is:

[0009] Axial-flow waterjet propulsion system, including:

[0010] Pump casing;

[0011] Guide vanes are fixedly installed inside the pump casing;

[0012] The pump shaft is capable of rotating about its own axis, and one end of the pump shaft extends into the pump casing.

[0013] An impeller is disposed inside the pump casing. One end of the pump shaft movably passes through the guide vane and is connected to the impeller in a transmission connection. The pump shaft can drive the impeller to rotate.

[0014] An adjustment component is disposed within the pump casing, and is connected to the impeller and capable of driving the impeller to move closer to or away from the guide vane.

[0015] In some embodiments, the axial-flow water jet propulsion device further includes a transition connector, which includes an inner ring and an outer ring coaxially sleeved together. The outer ring is connected to the adjustment assembly, and the inner ring is connected to the impeller. The outer ring can drive the inner ring to move synchronously, and the outer ring remains relatively stationary when the inner ring rotates.

[0016] In some embodiments, the adjustment component includes:

[0017] The nut component is rotatably disposed within the pump housing about its own axis;

[0018] A lead screw is disposed inside the pump housing. The axis of the lead screw is parallel to the axis of the pump shaft. The lead screw is fixedly connected to the impeller. A nut is threadedly connected to the lead screw. When the nut rotates around its own axis, it can drive the lead screw to perform reciprocating linear motion along its own axis.

[0019] In some embodiments, the adjusting assembly further includes a first limiting member, which is fixedly connected to the pump housing, and the end of the lead screw that is away from the impeller is slidably connected to the first limiting member.

[0020] In some embodiments, one of the first limiting member and the lead screw member is provided with a limiting groove extending along its own axial direction, and the other is provided with a protrusion that slides with the limiting groove.

[0021] In some embodiments, the adjusting assembly further includes a nut drive structure, the nut drive structure comprising:

[0022] The first driving component is fixedly disposed inside the pump housing;

[0023] A hollow transmission gear is connected to the first driving component, and the first driving component can drive the hollow transmission gear to rotate around its own axis.

[0024] A support ring is fixedly sleeved on the inner ring of the hollow transmission gear and on the outer ring of the nut. The support ring can restrict the radial movement of the hollow transmission gear.

[0025] In some embodiments, one of the outer ring of the support ring and the inner ring of the hollow transmission gear is provided with a fixing groove arranged along its own axial direction, and the other is provided with a fixing tooth that cooperates with the fixing groove.

[0026] In some embodiments, the nut has a stepped surface, which is fixedly connected to one end of the support ring near the impeller.

[0027] In some embodiments, one of the pump shaft and the impeller is provided with a movable groove extending along its own axial direction, and the other is provided with a guide key that slides with the movable groove.

[0028] To achieve this objective, the following approach is adopted in this application:

[0029] The method of using an axial-flow waterjet propulsion system, and controlling the operation of the aforementioned axial-flow waterjet propulsion system, includes the following steps:

[0030] The pump shaft is controlled to rotate, which drives the impeller to rotate, and the guide vanes change the fluid from rotational motion to axial motion.

[0031] When turbulence occurs, the pump shaft is controlled to stop rotating, and the adjusting component is controlled to adjust the distance between the guide vane and the impeller.

[0032] Control the pump shaft to rotate again.

[0033] The beneficial effects of this application are:

[0034] The axial-flow waterjet propulsion proposed in this application, by setting an adjustment component, can change the distance between the guide vane and the impeller, and can adjust the distance between the impeller and the guide vane in a timely and convenient manner. Without disassembling the axial-flow waterjet propulsion, the distance between the impeller and the guide vane can be made to meet the operating environment, avoid the generation of turbulence, and thus reduce vibration and noise, making the axial-flow waterjet propulsion more adaptable and more efficient.

[0035] The method of using the axial-flow waterjet propulsion proposed in this application can quickly and conveniently adjust the distance between the impeller and the guide vanes, enabling the axial-flow waterjet propulsion to adapt to different working conditions, reduce the occurrence of turbulence, reduce the vibration and noise generated during the operation of the axial-flow waterjet propulsion, and significantly improve working efficiency. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this application and these drawings without creative effort.

[0037] Figure 1 is a front view of an axial-flow waterjet propulsion device provided in an embodiment of this application;

[0038] Figure 2 is a front view of the guide vanes, impeller, and guide components of the axial-flow waterjet propulsion provided in an embodiment of this application.

[0039] Figure 3 is an enlarged view of point A in Figure 2;

[0040] Figure 4 is an enlarged view of point B in Figure 2;

[0041] Figure 5 is an enlarged view of point C in Figure 2;

[0042] Figure 6 is a schematic diagram of the screw connecting ring provided in an embodiment of this application;

[0043] Figure 7 is a structural schematic diagram of the first limiting member provided in an embodiment of this application;

[0044] Figure 8 is a structural schematic diagram of the first limiting member and the lead screw member provided in the embodiment of this application when they are in cooperation;

[0045] Figure 9 is a schematic diagram of the support ring provided in an embodiment of this application;

[0046] Figure 10 is a schematic diagram of the hollow transmission gear provided in an embodiment of this application;

[0047] Figure 11 is a structural schematic diagram of the nut component provided in an embodiment of this application.

[0048] In the picture:

[0049] 1. Pump casing; 2. Guide vane; 21. Guide vane hub; 22. Guide vane blade; 3. Pump shaft; 31. Moving groove; 4. Impeller; 41. Impeller hub; 42. Impeller blade; 431. First connecting sleeve; 432. Second connecting sleeve; 4321. Baffle; 433. Third connecting sleeve; 4331. Threaded connecting platform; 44. Transition connecting member limiting ring; 441. Radial protrusion; 5. Adjusting assembly; 51. Nut; 511. Stepped surface; 52. Lead screw; 521. Limiting groove; 522. Lead screw connecting ring; 523. Limiting surface; 53. First limiting member; 531. Protrusion; 532. Circular 54. Cylinder section; 54. Nut drive structure; 541. First drive component; 5411. Drive gear; 542. Hollow transmission gear; 5421. Fixed gear; 543. Support ring; 5431. Fixed groove; 5432. Flange; 5433. Support cylinder; 54331. Second limiting ring; 5434. Support bearing; 544. Bearing seat; 5441. Limiting platform; 5442. First limiting ring; 6. Transition connector; 61. Inner ring; 62. Outer ring; 7. Washer; 8. Guide component; 81. Bushing; 82. Bushing nut; 83. Fastening screw; 84. Fastening nut; 9. Drive motor. Detailed Implementation

[0050] To make the technical problems solved by this application, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of this application will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings.

[0051] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Specifically, the terms "first position" and "second position" refer to two different positions.

[0052] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0053] Referring to Figures 1 and 2, this application provides an axial-flow water jet propulsion device. This axial-flow water jet propulsion device includes a pump housing 1, guide vanes 2, a pump shaft 3, an impeller 4, and an adjusting assembly 5. The guide vanes 2 are fixedly disposed within the pump housing 1. The pump shaft 3 is rotatable about its own axis, with one end extending into the pump housing 1. The impeller 4 is disposed within the pump housing 1, and one end of the pump shaft 3 movably passes through the guide vanes 2 and is drively connected to the impeller 4, enabling the pump shaft 3 to drive the impeller 4 to rotate. The adjusting assembly 5 is disposed within the pump housing 1, connected to the impeller 4, and capable of driving the impeller 4 closer to or further away from the guide vanes 2.

[0054] Specifically, as shown in Figure 1, in this embodiment, the axial-flow waterjet propulsion device further includes a drive motor 9. The drive motor 9 drives the pump shaft 3 to rotate, and the pump shaft 3 can rotate the impeller 4 along the axis of the pump shaft 3 to make the liquid rotate. The guide vane 2 fixedly installed inside the pump casing 1 can eliminate the rotational motion of the liquid and convert the rotational motion of the liquid into axial motion, while converting the kinetic energy of the rotational motion into pressure energy, and pumping the liquid axially. The operator can adjust the impeller 4 by adjusting the component 5 according to the actual working scenario of the axial-flow waterjet propulsion device, so that the impeller 4 moves closer to or further away from the guide vane 2, and adjust the distance between the impeller 4 and the guide vane 2, so that the axial-flow waterjet propulsion device can adapt to different working conditions, reduce the occurrence of turbulence, and reduce the vibration and noise generated when the axial-flow waterjet propulsion device is working.

[0055] The axial-flow water jet propulsion provided in this application, by setting an adjustment component 5, can change the distance between the guide vane 2 and the impeller 4, and can adjust the distance between the impeller 4 and the guide vane 2 in a timely and convenient manner. Without disassembling the axial-flow water jet propulsion, the distance between the impeller 4 and the guide vane 2 can be made to meet the operating environment, avoid the generation of turbulence, and thus reduce vibration and noise, making the axial-flow water jet propulsion more adaptable and more efficient.

[0056] Furthermore, referring to Figures 2 and 3, the axial-flow water jet propulsion device also includes a transition connector 6. The transition connector 6 includes an inner ring 61 and an outer ring 62 coaxially sleeved. The outer ring 62 is connected to the adjustment component 5, and the inner ring 61 is connected to the impeller 4. The outer ring 62 can drive the inner ring 61 to move synchronously. When the inner ring 61 rotates, the outer ring 62 remains relatively stationary.

[0057] Specifically, as shown in Figures 1-3, in this embodiment, the transition connector 6 is a tapered roller bearing, with tapered rollers disposed between the inner ring 61 and the outer ring 62. The outer ring 62 of the tapered roller bearing is connected to the adjusting component 5, and the inner ring 61 is connected to the impeller 4. The outer ring 62 can move axially along the pump shaft 3 with the adjusting component 5, thereby moving the coaxially sleeved inner ring 61 and the impeller 4 connected to the inner ring 61 axially along the pump shaft 3.

[0058] Since the outer ring 62 remains relatively stationary when the inner ring 61 rotates, the pump shaft 3 can drive the impeller 4 to rotate around the axis of the pump shaft 3 when the axial flow water jet propulsion is working normally. At this time, the inner ring 61 rotates with the impeller 4, while the outer ring 62 remains stationary, thereby ensuring that the pump shaft 3 can drive the impeller 4 to rotate to achieve pumping liquid.

[0059] When it is necessary to adjust the distance between the guide vane 2 and the impeller 4, the pump shaft 3 is stationary. At this time, the adjusting component 5 drives the outer ring 62 to move, the outer ring 62 drives the inner ring 61 to move, and the inner ring 61 drives the impeller 4 to move, thereby realizing the adjustment of the distance between the guide vane 2 and the impeller 4.

[0060] More specifically, as shown in Figures 1 and 3, in this embodiment, the impeller 4 is provided with a first connecting cylinder 431 and a second connecting cylinder 432. The first connecting cylinder 431 is fixed to the impeller 4 by bolts, and the second connecting cylinder 432 is connected to the first connecting cylinder 431 by screws. The diameter of the second connecting cylinder 432 decreases near the guide vane 2, forming a step. The inner ring 61 of the transition connector 6 is installed on the outer periphery of the end of the second connecting cylinder 432 with the smaller diameter. The baffle 4321 is connected to the end of the second connecting cylinder 432 near the guide vane 2 by screws, that is, the inner ring 61 of the transition connector 6 is axially fixed by the baffle 4321 and the step.

[0061] Further, referring to Figure 4, the adjusting assembly 5 includes a nut 51 and a lead screw 52. The nut 51 is rotatably disposed within the pump housing 1 about its own axis. The lead screw 52 is disposed within the pump housing 1, and the axis of the lead screw 52 is parallel to the axis of the pump shaft 3. The lead screw 52 is fixedly connected to the impeller 4. The nut 51 is threadedly connected to the lead screw 52. When the nut 51 rotates about its own axis, it can drive the lead screw 52 to reciprocate linearly along its own axis, thereby causing the impeller 4 to move closer to or away from the guide vane 2.

[0062] Specifically, as shown in Figures 3 and 4, in this embodiment, the lead screw 52 is coaxially and spaced apart from the pump shaft 3, and one end of the lead screw 52 is connected to the impeller 4 through the transition connector 6. When the nut 51 rotates around its own axis, it drives the lead screw 52 to reciprocate linearly along the axis of the pump shaft 3, thereby causing the impeller 4, which is connected to the lead screw 52 through the transition connector 6, to also reciprocate linearly along the axis of the pump shaft 3, thus achieving adjustable distance between the guide vane 2 and the impeller 4. Adjusting the distance between the guide vane 2 and the impeller 4 through the lead screw and nut structure offers high transmission efficiency, timely and rapid adjustment, and good stability, long service life, and low maintenance costs.

[0063] Furthermore, as shown in Figure 3, the impeller 4 is also provided with a transition connector limiting ring 44 and a third connecting cylinder 433. The transition connector limiting ring 44 and the third connecting cylinder 433 are connected together by bolts, and the inner diameter of the third connecting cylinder 433 is smaller than the inner diameter of the transition connector limiting ring 44. A limiting surface 523 is provided on the lead screw 52, ​​and the third connecting cylinder 433 is threadedly connected to the lead screw 52 and can abut against the limiting surface 523. A radial protrusion 441 is provided on the transition connector limiting ring 44, and the radial protrusion 441 and the third connecting cylinder 433 axially fix the outer ring 62 of the transition connector 6.

[0064] Further, as shown in Figures 3 and 6, in this embodiment, the lead screw component 52 is also provided with a lead screw connecting ring 522. The lead screw connecting ring 522 has a first section with a larger diameter and a second section with a smaller diameter to form a limiting surface 523. The first section with a larger diameter has the same diameter as the lead screw component 52 and is connected to the end of the lead screw component 52 near the impeller 4 by a countersunk screw. The second section is provided with threads. The third connecting cylinder 433 is provided with a threaded connecting platform 4331. The threaded connecting platform 4331 is connected to the third connecting cylinder 433 by a countersunk screw. The threaded connecting platform 4331 is provided with threads that mate with the second section of the lead screw connecting ring 522.

[0065] Furthermore, referring to Figures 1 and 5, the adjusting assembly 5 also includes a first limiting member 53, which is fixedly connected to the pump housing 1, and the end of the lead screw 52 away from the impeller 4 is slidably connected to the first limiting member 53.

[0066] Specifically, as shown in Figures 1 and 5, the first limiting member 53 is fixedly mounted on the pump housing 1 by bolts, and the end of the lead screw 52 away from the impeller 4 is slidably connected to the first limiting member 53.

[0067] Further, as shown in Figures 1, 7, and 8, one of the first limiting member 53 and the lead screw member 52 is provided with a limiting groove 521 extending along its own axial direction, and the other is provided with a protrusion 531 that slides with the limiting groove 521. The first limiting member 53 restricts the lead screw member 52 from rotating around its own axis as the nut member 51 rotates, so that the lead screw member 52 can move along its own axial direction but cannot rotate around its own axis.

[0068] Specifically, as shown in Figures 4 and 8, in this embodiment, the lead screw 52 has a limiting groove 521, and the first limiting member 53 has a protrusion 531 that slides with the limiting groove 521. Under the limiting effect of the limiting groove 521 and the protrusion 531, when the nut 51 rotates around its own axis, it can drive the lead screw 52 to move along its own axis.

[0069] Furthermore, the first limiting member 53 also includes a cylindrical portion 532 connected to the protrusion 531, and the cylindrical portion 532 is sleeved inside the lead screw member 52.

[0070] Specifically, as shown in Figures 4 and 8, the cylindrical part 532 is coaxially arranged with the lead screw 52, ​​and the cylindrical part 532 can support the lead screw 52.

[0071] Furthermore, referring to Figures 4 and 5, a washer 7 is also provided between the cylindrical part 532 and the lead screw 52. The end surface of the lead screw 52 with the limit groove 521 is not threaded. By providing the washer 7, the lead screw 52 can be better supported, and the axial movement of the lead screw 52 is also more conducive.

[0072] Further, referring to Figure 4, the adjusting assembly 5 also includes a nut drive structure 54, which includes a first drive member 541, a hollow transmission gear 542, and a support ring 543. The first drive member 541 is fixedly disposed inside the pump housing 1. The hollow transmission gear 542 is connected to the first drive member 541, and the first drive member 541 can drive the hollow transmission gear 542 to rotate around its own axis. The support ring 543 is fixedly sleeved on the inner ring of the hollow transmission gear 542 and fixedly sleeved on the outer ring of the nut member 51, and the support ring 543 can restrict the radial movement of the hollow transmission gear 542.

[0073] The first driving component 541 can drive the hollow transmission gear 542 to rotate, and the hollow transmission gear 542 drives the nut component 51 to rotate through the support ring 543.

[0074] Specifically, as shown in Figures 1 and 4, in this embodiment, the first driving component 541 is a rotary motor, which is fixedly mounted on the guide vane 2 inside the pump housing 1. The output shaft of the rotary motor is provided with driving teeth 5411. The driving teeth 5411 mesh with the outer ring of the hollow transmission gear 542 and can drive the hollow transmission gear 542 to rotate around its own axis. The support ring 543 is fixedly sleeved on the outer ring of the nut component 51. The nut component 51 cooperates with the lead screw component 52, so the nut component 51 will not move radially, and consequently, the hollow transmission gear 542, whose inner ring is fixed to the support ring 543, will also not move radially.

[0075] Furthermore, one of the outer ring of the support ring 543 and the inner ring of the hollow transmission gear 542 is provided with a fixing groove 5431 arranged along its own axial direction, and the other is provided with a fixing tooth 5421 that cooperates with the fixing groove 5431.

[0076] Specifically, as shown in Figures 4, 9 and 10, in this embodiment, the support ring 543 is provided with a fixing groove 5431 arranged along its own axial direction, and the inner ring of the hollow transmission gear 542 is provided with a fixing tooth 5421 that cooperates with the fixing groove 5431. The fixing groove 5431 and the fixing tooth 5421 cooperate to restrict the hollow transmission gear 542 from radially moving when driven by the first driving member 541.

[0077] Furthermore, the nut 51 is provided with a stepped surface 511, which is fixedly connected to the end of the support ring 543 near the impeller 4.

[0078] Specifically, as shown in Figures 4 and 11, in this embodiment, the screw passes through the stepped surface 511 and the support ring 543 in sequence to fix the nut 51 to the support ring 543.

[0079] Furthermore, as shown in Figures 4 and 9, the support ring 543 is provided with a flange 5432, and the stepped surface 511 provided on the nut 51 can cooperate with the flange 5432 to limit the two ends of the hollow transmission gear 542 in the axial direction, thereby restricting the axial movement of the hollow transmission gear 542.

[0080] Furthermore, as shown in Figures 1, 3 and 4, in this embodiment, a support cylinder 5433 is also provided between the support ring 543 and the nut 51, and a support bearing 5434 for supporting the support cylinder 5433 is provided inside the pump housing 1.

[0081] By providing a support bearing 5434, the support ring 543 can be supported, thereby supporting the nut 51. Specifically, a bearing housing 544 for supporting the support bearing 5434 is provided inside the pump casing 1. A limiting platform 5441 facing the pump shaft 3 is provided at the end of the bearing housing 544 away from the impeller 4, and a first limiting ring 5442 is provided at the end of the bearing housing 544 near the impeller 4. The limiting platform 5441 and the first limiting ring 5442 can axially fix the outer ring of the support bearing 5434. A second limiting ring 54331 is provided at the end of the support cylinder 5433 away from the impeller 4. The second limiting ring 54331 and the support ring 543 axially fix the inner ring of the support bearing 5434.

[0082] Furthermore, referring to Figures 1 and 3, one of the pump shaft 3 and the impeller 4 is provided with a movable groove 31 extending along its own axial direction, and the other is provided with a guide key that slides with the movable groove 31.

[0083] Specifically, as shown in Figures 1 and 3, in this embodiment, the pump shaft 3 is provided with a movable groove 31 extending along its own axial direction, and the impeller 4 is provided with a guide key that cooperates with the movable groove 31. The guide key and the movable groove 31 cooperate, allowing the pump shaft 3 to drive the impeller 4 to rotate around its own axis. At the same time, guided by the movable groove 31, when adjusting the distance between the impeller 4 and the guide vane 2, the guide key can move within the movable groove 31. The two cooperate to guide the movement of the impeller 4, so that the impeller 4 moves closer to or further away from the guide vane 2 under the action of the adjusting component 5.

[0084] More specifically, as shown in Figures 1, 3 and 4, in this embodiment, the impeller 4 includes impeller blades 42 and an impeller hub 41. The impeller hub 41 is movably sleeved on the pump shaft 3, and the impeller hub 41 will not rotate when the pump shaft 3 rotates. The impeller blades 42 are arranged on the outer ring of the impeller hub 41, and a guide key is provided on the inner ring of the impeller hub 41.

[0085] Furthermore, in order to prevent the key from dislodging from the moving groove 31 on the pump shaft 3, a key limiting plate is also provided on the pump shaft 3. The key limiting plate is connected to the pump shaft 3 by screws. The key limiting plate can block the opening of the moving groove 31 and prevent the key from dislodging from the moving groove 31 when it moves away from the guide vane 2 as the impeller hub 41 moves away from the guide vane 2.

[0086] Furthermore, referring to Figure 2, a guide element 8 is also provided at the end of the impeller hub 41 away from the guide vane 2.

[0087] Specifically, as shown in Figures 2-4, in this embodiment, a bushing 81 is provided on the impeller hub 41. The bushing 81 has a hole, and bolts pass sequentially through the bushing 81, the impeller hub 41, and the first connecting sleeve 431 to fix the bushing 81 and the first connecting sleeve 431 to the impeller hub 41. A bushing nut 82 is threadedly connected to the end of the bushing 81 away from the impeller 4, and a fastening threaded hole is provided in the center of the bushing nut 82. The guide member 8 is fixed to the impeller hub 4 by a fastening screw 83 and a fastening nut 84. A countersunk hole is provided at the pointed end of the guide member 8, and the fastening screw 83 passes through the guide member 8 and is threadedly connected to the fastening threaded hole in the center of the bushing nut 82. The fastening nut 84 is located within the countersunk hole.

[0088] Further, as shown in Figures 1-3, the guide vane 2 includes guide vane blades 22 and a guide vane hub 21. The guide vane blades 22 are fixed inside the pump casing 1, and the guide vane hub 21 is sleeved on the pump shaft 3 and fixedly connected to the guide vane blades 22. The guide vane hub 21 and the impeller hub 41 are sleeved and connected, and a sealing element is provided at the connection. Specifically, the sealing element is a sealing ring, and two are spaced apart along the axial direction.

[0089] This embodiment also provides a method for using an axial-flow waterjet propulsion device, controlling the aforementioned axial-flow waterjet propulsion device to operate, including the following steps:

[0090] The pump shaft 3 is controlled to rotate, which drives the impeller 4 to rotate. The guide vane 2 changes the fluid from rotational motion to axial motion.

[0091] When turbulence occurs, the pump shaft 3 is stopped from rotating, and the regulating component 5 is used to adjust the distance between the guide vane 2 and the impeller 4.

[0092] Control the pump shaft 3 to rotate again.

[0093] Specifically, as shown in Figures 1-11, in this embodiment, the drive motor 9 is started to control the pump shaft 3 to rotate. When the axial flow water jet propulsion is working normally, due to the action of the guide key, the pump shaft 3 will drive the first connecting cylinder 431, the second connecting cylinder 432, and the inner ring 61 of the transition connector 6 to rotate together. The outer ring 62 of the transition connector 6 will not rotate with it, so that the transition connector limiting ring 44, the lead screw 52, ​​and the nut 51 will not rotate, allowing the axial flow water jet propulsion to work normally.

[0094] When turbulence occurs, the distance between the guide vane 2 and the impeller 4 needs to be adjusted. The drive motor 9 stops working, the pump shaft 3 stops rotating, and the first drive component 541 rotates, which in turn causes the hollow transmission gear 542 to rotate. The hollow transmission gear 542 transmits power to the support ring 543, and the support ring 543 transmits power to the nut component 51 through screws. When the nut component 51 rotates, the support bearing 5434 fixes the nut component 51 axially and radially through the support cylinder 5433. The nut component 51 transmits power to the lead screw component 52. Due to the radial constraint generated by the engagement of the protrusion 531 on the first limiting component 53 and the limiting groove 521, the lead screw component 52 does not rotate but moves axially. The screw drives the lead screw connecting ring 522, which is threaded onto the threaded connecting platform 4331. The lead screw connecting ring 522 drives the threaded connecting platform 4331, which in turn drives the third connecting cylinder 433. The third connecting cylinder 433 drives the transition connecting member limiting ring 44, which in turn drives the outer ring 62 of the transition connecting member 6, thereby driving the inner ring 61 of the transition connecting member 6. The inner ring 61 drives the second connecting cylinder 432, which in turn drives the first connecting cylinder 431. The first connecting cylinder 431 drives the impeller hub 41, thereby causing the impeller 4 to move axially. After adjustment is completed and turbulence disappears, the first driving member 541 is stopped, and the drive motor 9 is restarted to drive the pump shaft 3 to rotate.

Claims

1. An axial-flow waterjet propulsion device, comprising: Pump casing (1); Guide vane (2) is fixedly installed inside the pump casing (1); The pump shaft (3) is capable of rotating about its own axis, and one end of the pump shaft (3) extends into the pump casing (1); An impeller (4) is disposed inside the pump casing (1). One end of the pump shaft (3) passes through the guide vane (2) and is connected to the impeller (4) in a transmission. The pump shaft (3) can drive the impeller (4) to rotate. An adjustment component (5) is disposed inside the pump casing (1). The adjustment component (5) is connected to the impeller (4) and can drive the impeller (4) to move closer to or away from the guide vane (2).

2. The axial-flow water jet propulsion device according to claim 1 further includes a transition connector (6), the transition connector (6) includes an inner ring (61) and an outer ring (62) coaxially sleeved, the outer ring (62) is connected to the adjustment component (5), the inner ring (61) is connected to the impeller (4), the outer ring (62) can drive the inner ring (61) to move synchronously, and the outer ring (62) remains relatively stationary when the inner ring (61) rotates.

3. The axial-flow waterjet propulsion device according to claim 1, wherein, The adjustment component (5) includes: The nut (51) is rotatably disposed inside the pump housing (1) about its own axis; A lead screw (52) is disposed inside the pump housing (1). The axis of the lead screw (52) is parallel to the axis of the pump shaft (3). The lead screw (52) is fixedly connected to the impeller (4). The nut (51) is threadedly connected to the lead screw (52). When the nut (51) rotates around its own axis, it can drive the lead screw (52) to reciprocate linearly along its own axis.

4. The axial-flow waterjet propulsion device according to claim 3, wherein, The adjustment component (5) further includes a first limiting member (53), which is fixedly connected to the pump housing (1), and the end of the lead screw (52) away from the impeller (4) is slidably connected to the first limiting member (53).

5. The axial-flow waterjet propulsion device according to claim 4, wherein, One of the first limiting member (53) and the lead screw member (52) is provided with a limiting groove (521) extending along its own axial direction, and the other is provided with a protrusion (531) that slides with the limiting groove (521).

6. The axial-flow waterjet propulsion device according to claim 3, wherein, The adjusting assembly (5) further includes a nut drive structure (54), which includes: The first driving component (541) is fixedly disposed inside the pump housing (1); A hollow transmission gear (542) is connected to the first driving member (541) for transmission, and the first driving member (541) can drive the hollow transmission gear (542) to rotate around its own axis; The support ring (543) is fixedly sleeved on the inner ring of the hollow transmission gear (542) and fixedly sleeved on the outer ring of the nut (51). The support ring (543) can restrict the radial movement of the hollow transmission gear (542).

7. The axial-flow waterjet propulsion device according to claim 6, wherein, One of the outer ring of the support ring (543) and the inner ring of the hollow transmission gear (542) is provided with a fixing groove (5431) arranged along its own axial direction, and the other is provided with a fixing tooth (5421) that cooperates with the fixing groove (5431).

8. The axial-flow waterjet propulsion device according to claim 6, wherein, The nut (51) is provided with a stepped surface (511), and the stepped surface (511) is fixedly connected to the end of the support ring (543) near the impeller (4).

9. The axial-flow waterjet propulsion device according to claim 1, wherein, One of the pump shaft (3) and the impeller (4) is provided with a movable groove (31) extending along its own axial direction, and the other is provided with a guide key that slides with the movable groove (31).

10. A method of using an axial-flow waterjet propulsion device, controlling the axial-flow waterjet propulsion device according to any one of claims 1-9 to operate, comprising the following steps: The pump shaft (3) is controlled to rotate, and the pump shaft (3) drives the impeller (4) to rotate. The guide vane (2) causes the fluid to change from rotational motion to axial motion. When turbulence occurs, the pump shaft (3) is controlled to stop rotating, and the adjusting component (5) is controlled to adjust the distance between the guide vane (2) and the impeller (4); Control the pump shaft (3) to rotate again.

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