Water jet propulsion pump system and ship

Abstract

The invention relates to the technical field of ships, and particularly discloses a water jet propulsion pump system and a ship. A liquid suction bent pipe, a liquid suction straight pipe, a pump shell and a spray pipe of the water spray propulsion pump system are sequentially communicated to form a fluid flow channel; one end of the driving shaft is in transmission connection with the first body of the impeller, and the other end extends out of the liquid suction elbow and is used for driving the impeller to rotate around the central axis; a second body of the guide vane structure is rotationally connected with a first body, vane roots and vane tops of first guide vanes are fixedly connected with the outer peripheral wall of the second body and the inner peripheral wall of a spray pipe in a one-to-one correspondence mode, and the number of the first guide vanes and the number of impeller vanes are coprime. The caudal vertebra body is fixedly connected to the second body and is far away from the first body relative to the second body; the at least two second guide vanes are fixed on the peripheral wall of the caudal vertebra body; and in the circumferential direction of the second body, one second guide vane is distributed between any two adjacent first guide vanes. According to the jet propulsion pump system, the propulsion efficiency and the sound stealth performance of the jet propulsion pump system can be improved on the basis that the size is not increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ship technology, and particularly relates to a water jet propulsion pump system and a ship. BACKGROUND

[0002] At present, the pumps applied to ships mainly include water jet propulsion mixed flow pumps and axial flow pumps. Compared with the axial flow pumps, the water jet propulsion mixed flow pumps have higher flow coefficient and head coefficient, so the water jet propulsion mixed flow pumps have more advantages in the application to high-speed ships in the case of only single-stage pumps.

[0003] The water jet propulsion mixed flow pump in the related art mainly comprises a pipeline, a pump shell, an impeller, guide vanes and an input shaft. The pipeline is used for forming a fluid flow channel. The pump shell is a component of the pipeline. The impeller is arranged in the fluid flow channel and rotationally connected with the input shaft. The input shaft drives the impeller to rotate around the central axis of the input shaft, so that the impeller converts mechanical energy into kinetic energy and pressure energy of the fluid. The guide vanes are fixedly arranged in the fluid flow channel and used for guiding the flow of the fluid and weakening the rotational motion of the fluid. Since the guide vanes are stationary and the number of the guide vane blades is limited, there is still a pressure difference and a velocity difference between the front and back sides of the guide vane blades in the axial direction of the input shaft due to the existence of the rotational component of the fluid. A large flow separation zone is formed on the suction surface of the guide vane blade and extends to the vicinity of the nozzle of the fluid flow channel region corresponding to the guide vane blade, which is not conducive to the propulsion efficiency and acoustic stealth performance of the water jet propulsion mixed flow pump. SUMMARY

[0004] The present application aims to provide a water jet propulsion pump system and a ship to solve the above problems of the water jet propulsion mixed flow pump in the related art.

[0005] The water jet propulsion pump system comprises a liquid suction elbow, a liquid suction straight pipe, a nozzle, a pump body and a guide vane structure. The pump body comprises a pump shell, a driving shaft and an impeller in the pump shell. The liquid suction elbow, the liquid suction straight pipe, the pump shell and the nozzle are sequentially communicated to form a fluid flow channel. The impeller comprises a first body and impeller blades fixedly connected to the peripheral wall of the first body. The first body is in transmission connection with the first end of the driving shaft. The second end of the driving shaft extends out of the liquid suction elbow. The driving shaft is used for driving the impeller to rotate around the central axis of the driving shaft. The guide vane structure is located in the nozzle. The guide vane structure comprises first guide vanes and a second body in rotational connection with the first body. The blade root of the first guide vanes is fixedly connected with the peripheral wall of the second body. The blade top of the first guide vanes is fixedly connected with the inner peripheral wall of the nozzle. The number of the first guide vanes and the number of the impeller blades are co-prime. The water jet propulsion pump system further comprises a tail vertebra guide structure. The tail vertebra guide structure comprises:

[0006] a tail vertebra body fixedly connected to the second body and away from the first body relative to the second body;

[0007] at least two second guide vanes fixedly connected to the outer circumferential wall of the tail vertebra body, and one second guide vane is distributed between any two adjacent first guide vanes along the circumference of the second body.

[0008] As an optional solution of the water jet propulsion pump system, the central axis of the driving shaft, the central axis of the liquid suction straight pipe, the central axis of the pump shell and the central axis of the nozzle are collinear, the shortest distance from the highest point of the blade trailing edge of the first guide vane to the central axis of the driving shaft is h;

[0009] the shortest distance from the highest point of the blade leading edge of the second guide vane to the central axis of the driving shaft is h1, h1=(0.55-0.7)h; and / or, the shortest distance from the highest point of the blade trailing edge of the second guide vane to the central axis of the driving shaft is h2, h2=(0.4-0.5)h.

[0010] As an optional solution of the water jet propulsion pump system, the blade airfoil of the second guide vane is a double convex symmetric airfoil.

[0011] As an optional solution of the water jet propulsion pump system, the blade wrap angle of the second guide vane is α, 0<α≤35°.

[0012] As an optional solution of the water jet propulsion pump system, the inlet installation angle of the blade airfoil of the second guide vane is β1, 0°<β1≤30°; and / or,

[0013] the outlet installation angle of the blade airfoil of the second guide vane is β2, 0°<β2≤30°.

[0014] As an optional solution of the water jet propulsion pump system, the maximum thickness of the first guide vane is d1, the maximum thickness of the second guide vane is d2, 0.5d1≤d2≤d1.

[0015] As an optional solution of the water jet propulsion pump system, the axial length of the tail vertebra body is L;

[0016] the shortest distance between the first connection position on the blade leading edge of the second guide vane and the tip of the tail vertebra body is L1, L1=(0.9-0.95)L; and / or, the shortest distance between the second connection position on the blade trailing edge of the second guide vane and the tip of the tail vertebra body is L2, L2=(0.2-0.3)L.

[0017] As an optional solution of the water jet propulsion pump system, for any one of the second guide vanes, a projection of a blade leading edge of the second guide vane on a preset plane is a first straight line, a projection of a blade trailing edge of the second guide vane on the preset plane is a second straight line, a projection of a connecting position of the second guide vane and the tail vane body on the preset plane is a third straight line, a center axis of the tail vane body and any point on a camber line of a blade airfoil of the second guide vane form the preset plane, the third straight line is away from an extension line of the blade leading edge of the second guide vane to form a fourth straight line, an included angle between the first straight line and the third straight line is θ1, an included angle between the second straight line and the fourth straight line is θ2, θ2≤θ1, 130°≤θ1≤140°, and 130°≤θ2≤140°.

[0018] As an optional solution of the water jet propulsion pump system, a profile line of the tail vane body on the preset plane is two first straight lines intersecting at a fixed point, and an included angle between any one of the first straight lines and the center axis of the tail vane body is θ3, 85°≤θ1-θ3≤95°.

[0019] A ship, comprising the water jet propulsion pump system.

[0020] Advantages:

[0021] The application provides a water jet propulsion pump system and a ship. When the water jet propulsion pump system works, fluid sucked by a liquid suction elbow flows to a pump body through a liquid suction straight pipe, a driving shaft drives an impeller to rotate around a center axis thereof, so that the fluid has certain kinetic energy and pressure energy and flows out of the pump body and is sprayed out of a nozzle.

[0022] The liquid suction straight pipe can provide a smooth flow path for the fluid before the fluid enters the pump body, so as to weaken the rotation and separation of the fluid after the fluid flows through the liquid suction elbow, so that the fluid can flow into the pump body more uniformly and stably, thereby effectively relieving the phenomenon that each impeller blade is subjected to uneven force due to uneven flow velocity of the fluid, and effectively relieving vibration noise generated by unstable flow of the fluid, and improving the acoustic stealth performance of the water jet propulsion pump system. In addition, such a configuration can reduce energy dissipation of the fluid and improve the propulsion efficiency of the water jet propulsion pump system.

[0023] Secondly, by setting at least two second guide vanes on the periphery of the tail vertebra body, it can be understood that the first guide vane of the guide vane structure and the second guide vane of the tail vertebra guide flow structure form a two-stage guide flow structure. The fluid output by the pump body first passes through the first guide vane for guide flow, then passes through the second guide vane for guide flow, and finally is sprayed out by the nozzle. The second guide vane compensates for the part of the rotating component of the fluid that cannot be eliminated by the first guide vane, effectively inhibits or even eliminates the flow separation phenomenon of the fluid guided out by the first guide vane, and the eliminated rotating component is converted into the pressure energy of the fluid, so that the fluid has high pressure energy when sprayed out of the nozzle, thereby effectively relieving the phenomenon of blockage of the fluid flow channel caused by the formation of rotating vortex flow, and further improving the propulsion efficiency of the water jet propulsion pump system. Secondly, such setting can effectively relieve the vibration noise generated by unstable flow of the fluid, further improving the acoustic stealth performance of the water jet propulsion pump system. Secondly, such setting can effectively reduce the design size of the guide vane structure.

[0024] Secondly, by setting the number of first guide vanes and the number of impeller blades to be co-prime, mechanical vibration and noise level caused by resonance can be avoided, thereby further improving the acoustic stealth performance of the water jet propulsion pump system.

[0025] Therefore, the jet propulsion pump system can effectively improve its propulsion efficiency and acoustic stealth performance without increasing the volume, thereby effectively improving the working performance of the ship. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A cross-sectional view of the jet propulsion pump system provided by the embodiment of the present application is provided.

[0027] Figure 2 A structure schematic view of the guide vane structure provided by the embodiment of the present application is provided.

[0028] Figure 3 A structure schematic view of the guide vane structure and the tail vertebra guide flow structure along a first viewing angle provided by the embodiment of the present application is provided.

[0029] Figure 4 A structure schematic view of the guide vane structure and the tail vertebra guide flow structure along a second viewing angle provided by the embodiment of the present application is provided.

[0030] Figure 5 A structure schematic view of the guide vane structure and the tail vertebra guide flow structure along a third viewing angle provided by the embodiment of the present application is provided.

[0031] Figure 6 A projection view of the guide vane structure and the tail vertebra guide flow structure on a preset plane provided by the embodiment of the present application is provided.

[0032] Figure 7A structural schematic view of the tail vertebra flow guide structure along a third perspective view is provided for the embodiment of the present application.

[0033] Figure 8 A structural schematic view of the second flow guide vane is provided for the embodiment of the present application.

[0034] In the figure:

[0035] 1, liquid suction elbow pipe;

[0036] 2, liquid suction straight pipe;

[0037] 3, spray pipe;

[0038] 4, pump body; 41, pump shell; 42, driving shaft; 43, impeller; 431, first body; 432, impeller blade;

[0039] 5, guide vane structure; 51, first flow guide vane; 52, second body;

[0040] 6, fluid flow channel;

[0041] 7, tail vertebra flow guide structure; 71, tail vertebra body; 72, second flow guide vane;

[0042] 8, oil chamber; 81, bearing; 82, lubricating oil cavity. DETAILED DESCRIPTION

[0043] The technical solutions of the present application will be described clearly and completely below in combination with the drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions, and moreover, the "above", "above" and "above" of the first feature on the second feature include the first feature above and obliquely above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature on the second feature include the first feature below and obliquely below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0046] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0047] This invention provides a waterjet propulsion pump system, such as... Figures 1-7 As shown, the water jet propulsion pump system includes a suction bend 1, a suction straight pipe 2, a nozzle 3, a pump body 4, a guide vane structure 5, and a tail cone guide structure 7. The pump body 4 includes a pump casing 41, a drive shaft 42, and an impeller 43 located within the pump casing 41. The suction bend 1, suction straight pipe 2, pump casing 41, and nozzle 3 are sequentially connected to form a fluid flow channel 6. The impeller 43 includes a first body 431 and impeller blades 432 fixedly connected to the outer peripheral wall of the first body 431. The first body 431 is drively connected to the first end of the drive shaft 42, and the second end of the drive shaft 42 extends out of the suction bend 1. The drive shaft 42 drives the impeller 43 to rotate around its own central axis. The guide vane structure 5 is located within the nozzle 3 and includes first guide vanes 51 and a second body 52 rotatably connected to the first body 431. The root of the first guide vane 51 is fixedly connected to the outer peripheral wall of the second body 52, and the tip of the first guide vane 51 is fixedly connected to the inner peripheral wall of the nozzle 3. The number of first guide vanes 51 and the number of impeller blades 432 are coprime. The tail cone guide structure 7 includes a tail cone body 71 and at least two second guide vanes 72. The tail cone body 71 is fixedly connected to the second body 52 and is far away from the first body 431 relative to the second body 52. ​​At least two second guide vanes 72 are fixedly connected to the outer peripheral wall of the tail cone body 71. Along the circumference of the second body 52, a second guide vane 72 is distributed between any two adjacent first guide vanes 51.

[0048] When the water jet propulsion pump system is working, the fluid drawn in by the suction bend 1 flows through the suction straight pipe 2 and then flows to the pump body 4. The drive shaft 42 drives the impeller 43 to rotate around its own central axis, so that the fluid has a certain kinetic energy and pressure energy to flow out of the pump body 4 and be ejected by the nozzle 3.

[0049] Wherein, since the liquid suction elbow pipe 1 is a curved pipe section, by setting the liquid suction straight pipe 2 between the liquid suction elbow pipe 1 and the pump shell 41, the liquid suction straight pipe 2 can provide a smooth flow path for the fluid before the fluid enters the pump body 4, and the liquid suction straight pipe 2 can weaken the rotation and separation phenomenon of the fluid after the fluid flows through the liquid suction elbow pipe 1, so that the fluid can flow more uniformly and stably into the pump body 4, thereby effectively alleviating the phenomenon that each impeller blade 432 is unevenly stressed due to uneven fluid velocity, and effectively alleviating the vibration noise generated by unstable fluid flow, and improving the acoustic stealth performance of the water jet propulsion pump system.

[0050] Secondly, by setting at least two second guide vanes 72 on the outer periphery of the tail vertebra body 71, it can be understood that the first guide vane 51 of the guide vane structure 5 and the second guide vane 72 of the tail vertebra guide structure 7 form a two-stage guide structure, the fluid output by the pump body 4 first passes through the first guide vane 51 for guiding, and then passes through the second guide vane 72 for guiding, and finally is sprayed out by the nozzle 3, the second guide vane 72 compensates for the part of the rotation component of the fluid that cannot be eliminated by the first guide vane 51, effectively inhibits or even eliminates the flow separation phenomenon of the fluid guided by the first guide vane 51, and the eliminated rotation component is converted into pressure energy of the fluid, so that the fluid sprayed out by the nozzle 3 has high pressure energy, thereby effectively alleviating the phenomenon that the fluid forms a rotating vortex to cause the fluid flow passage 6 to be blocked, and further improving the propulsion efficiency of the water jet propulsion pump system; secondly, such a setting can also effectively alleviate the vibration noise generated by unstable fluid flow, further improving the acoustic stealth performance of the water jet propulsion pump system; thirdly, such a setting can also effectively reduce the design size of the guide vane structure 5.

[0051] Secondly, by setting the number of first guide vanes 51 and the number of impeller blades 432 to be co-prime, mechanical vibration and noise level caused by resonance can be avoided, thereby further improving the acoustic stealth performance of the water jet propulsion pump system.

[0052] Therefore, the water jet propulsion pump system can effectively improve its propulsion efficiency and acoustic stealth performance without increasing the volume, thereby effectively improving the working performance of the ship.

[0053] It can be understood that the tail vertebra body 71 is away from the first body 431 along the axial direction of the drive shaft 42 relative to the second body 52.

[0054] It can be understood that, since the number of the second guide vanes 72 is at least two, and one second guide vane 72 is distributed between any two adjacent first guide vanes 51, the number of the first guide vanes 51 is at least three. Since the number of the first guide vanes 51 and the number of the impeller blades 432 are co-prime, the number of the impeller blades 432 is at least two. Further, the at least three first guide vanes 51 are spaced along the circumference of the second body 52; the at least two second guide vanes 72 are spaced along the circumference of the tail vertebra body 71; and the at least two impeller blades 432 are spaced along the circumference of the first body 431.

[0055] In the embodiment, the exemplary setting fluid is water.

[0056] In the embodiment, as shown in Figures 2-5 and Figure 7 , the number of the first guide vanes 51 and the number of the second guide vanes 72 are both nine, and the number of the impeller blades 432 is five. It can be understood that, the number of the first guide vanes 51, the number of the second guide vanes 72, and the number of the impeller blades 432 can be adaptively increased or decreased according to actual working condition requirements.

[0057] In the embodiment, the impeller 43 is a semi-open impeller. The purpose of using the semi-open impeller for the impeller 43 is that the inlet flow passage of the impeller 43 is wider and is not easy to be entangled or blocked by waterweeds, sundries, etc., which is suitable for sailing in complex water areas. In addition, the semi-open impeller has a simple structure and small flow resistance, so that the ship can maintain a high propelling efficiency under medium and high speed running conditions, and is easy to maintain and clean.

[0058] In the embodiment, the guide vane structure 5 adopts a closed guide vane structure. Based on that the impeller 43 is a semi-open impeller, the guide vane structure 5 is set as a closed guide vane structure, which can effectively convert the kinetic energy of the fluid into pressure energy, reduce the loss of vortex and turbulence, and improve the propelling efficiency of the waterjet propelling pump system. In addition, it is beneficial for the semi-open impeller to output thrust more effectively when the ship runs at a high speed. Specifically, the tip of the first guide vane 51 is fixedly connected to the inner circumferential wall of the nozzle 3 by welding, and the root of the first guide vane 51 is fixedly connected to the outer circumferential wall of the second body 52 by welding.

[0059] In the embodiment, the root of the second guide vane 72 is fixedly connected to the outer circumferential wall of the tail vertebra body 71 by welding.

[0060] In the embodiment, as shown in Figure 1As shown, the end face of the suction bend 1, away from the suction straight tube 2, is exemplarily configured to be parallel to the horizontal plane. It can be understood that the end face of the suction bend 1, away from the suction straight tube 2, is parallel to and spaced apart from the central axis of the drive shaft 42. This configuration facilitates fluid intake by the suction bend 1 and results in a larger end face area at the inlet of the suction bend 1, thereby improving suction efficiency.

[0061] In this embodiment, the two axial ends of the straight suction pipe 2 are sealed to the suction bend pipe 1 and the pump housing 41 respectively; the pump housing 41 is also sealed to the nozzle 3. This improves the sealing performance of the formed fluid channel 6 and facilitates the assembly of the guide vane structure 5, the tail cone guide structure 7, the drive shaft 42, and the impeller 43. The sealing connection is achieved by welding; or, as... Figure 1 As shown, the sealing connection method is to connect the two structures by bolts and nuts, and seal the gap between the two structures by a sealing ring.

[0062] In this embodiment, as Figure 1 As shown, the first end of the drive shaft 42 is keyed to the first body 431. This enables the drive shaft 42 to drive the first body 431 to rotate around its central axis. The roots of the impeller blades 432 are fixedly connected to the outer peripheral wall of the first body 431 by welding.

[0063] Among them, such as Figure 1 As shown, the central axis of the drive shaft 42, the central axis of the suction straight pipe 2, the central axis of the pump housing 41, the central axis of the pipe, the central axis of the first body 431, and the central axis of the second body 52 are all collinear. Among them, as... Figure 6 As shown, the shortest distance from the highest point of the trailing edge of the first guide vane 51 to the central axis of the drive shaft 42 is h. Figure 6 and Figure 7 As shown, the shortest distance from the highest point of the leading edge of the second guide vane 72 to the central axis of the drive shaft 42 is h1. Figure 6 and Figure 7 As shown, the shortest distance from the highest point of the trailing edge of the second guide vane 72 to the central axis of the drive shaft 42 is h2.

[0064] Optionally, h1 = (0.55~0.7)h. The value of h1 can be adaptively set according to the actual working conditions: 0.55h, 0.6h, 0.65h, or 0.7h, etc. The range of h1 values ​​is an empirical range obtained from a large number of previous tests.

[0065] Optionally, h2 = (0.4~0.5)h. The value of h2 can be adaptively set according to the actual working conditions: 0.4h, 0.42h, 0.45h, or 0.5h, etc. The range of h2 values ​​is an empirical range obtained from a large number of previous experiments.

[0066] In this embodiment, preferably, h1=(0.55-0.7)h, and h2=(0.4-0.5)h.

[0067] Since the flow turbulence phenomenon caused by the first guide vane 51 is generally concentrated in the area where the root of the first guide vane 51 is located, by setting h1=(0.55-0.7)h, and h2=(0.4-0.5)h, the second guide vane 72 can effectively guide the fluid flowing out of the area where the root of the first guide vane 51 is located, thereby effectively weakening the vortex phenomenon formed by the fluid flowing out of the first guide vane 51, and effectively improving the propulsion efficiency of the water jet propulsion pump system.

[0068] Specifically, the blade leading edge is the most forward intersection point of the camber line and the chord line of the airfoil, which is the starting position of the fluid entering the airfoil. The blade trailing edge is the last intersection point of the camber line and the chord line of the airfoil, which is the position of the fluid leaving the airfoil. The chord line is a straight line connecting the blade leading edge and the blade trailing edge, and its length is called chord length, which is the basic dimension of the airfoil. The camber line of the airfoil is the connecting line of the centers of all the inscribed circles of the airfoil, which is used to describe the curvature characteristics of the airfoil. Further, the camber line of the symmetric airfoil coincides with the chord line, and the distance between the camber line and the chord line is the largest at the maximum thickness.

[0069] Optionally, in this embodiment, as shown in Figure 7 and Figure 8 , the blade airfoil of the second guide vane 72 is a biconvex symmetric airfoil. By setting the blade airfoil of the second guide vane 72 as a biconvex symmetric airfoil, the surface pressure distribution of the second guide vane 72 can be optimized, the flow loss can be reduced, the flow uniformity and stability of the fluid can be improved, the pressure pulsation and noise can be reduced, thereby further improving the propulsion efficiency and acoustic stealth performance of the water jet propulsion pump system; secondly, the symmetric structure is convenient for processing and manufacturing.

[0070] Specifically, in this embodiment, as shown in Figure 7 and Figure 8 , from the blade leading edge of the second guide vane 72 to the blade trailing edge of the second guide vane 72, the second guide vane 72 is divided into a first segment, a second segment and a third segment connected in sequence, and from the first segment to the third segment of the second guide vane 72, the thickness of the first segment gradually increases, the thickness of each part of the second segment is substantially equal, and the thickness of the third segment gradually decreases. This can effectively reduce the flow loss, improve the flow uniformity and stability of the fluid, and reduce the pressure pulsation and noise.

[0071] Further optionally, as shown in Figure 8As shown, the blade wrap angle of the second guide vane 72 is a, and 0 < a < 35°. The value of a can be set adaptively according to actual working condition requirements, such as 10°, 20°, 25°, 30°, or 35°, etc. The value range of a is an experience range obtained from a large number of previous tests.

[0072] Further optionally, as shown, Figure 8 the inlet setting angle of the blade airfoil of the second guide vane 72 is b1, and 0° < b1 < 30°. The value of b1 can be set adaptively according to actual working condition requirements, such as 10°, 20°, 25°, or 30°, etc. The value range of b1 is an experience range obtained from a large number of previous tests.

[0073] Further optionally, as shown, Figure 8 the outlet setting angle of the blade airfoil of the second guide vane 72 is b2, and 0° < b2 < 30°. The value of b2 can be set adaptively according to actual working condition requirements, such as 10°, 20°, 25°, or 30°, etc. The value range of b2 is an experience range obtained from a large number of previous tests.

[0074] In this embodiment, as shown, Figure 8 preferably, 0 < a < 35°, 0° < b1 < 30°, and 0° < b2 < 30°.

[0075] On the basis of the double-convex symmetric airfoil of the blade airfoil of the second guide vane 72, the blade wrap angle a, the inlet setting angle b1, and the outlet setting angle b2 are reasonably designed, so that the fluid flows to the outlet of the nozzle 3 according to the specified path and flows out of the nozzle 3, thereby being able to substantially eliminate the rotational component of the fluid flowing out of the second guide vane 72, further improve the pressure of the fluid, further avoid the fluid flow passage 6 from being blocked, and thereby further improve the propulsion efficiency and acoustic stealth performance of the water propulsion pump system.

[0076] Specifically, the blade wrap angle refers to the included angle between the inlet edge and the outlet edge of the blade in the circumferential direction of the impeller 43, and is used to reflect the guiding length of the guided fluid. The inlet setting angle refers to the included angle between the tangent of the inlet edge of the blade and the tangent of the intersection of the outer circle of the impeller 43, and is used to control the inlet direction of the fluid. The outlet setting angle refers to the included angle between the tangent of the outlet edge of the blade and the tangent of the intersection of the outer circle of the impeller 43, and is used to control the outlet direction of the fluid.

[0077] wherein the maximum thickness of the first guide vane 51 is d1. As shown, Figure 8 the maximum thickness of the second guide vane 72 is d2.

[0078] Optionally, in this embodiment, 0.5d1≤d2≤d1. The value of d2 can be adaptively set according to actual working conditions: 0.5d1, 0.6d1, 0.7d1, 0.8d1, 0.9d1, or d1, etc. The range of d2 values ​​is an empirical range obtained from a large number of previous experiments.

[0079] By setting 0.5d1≤d2≤d1, the second guide vane 72 has sufficient structural strength and can effectively ensure the reliability of the root of the second guide vane 72 being welded to the outer peripheral wall of the tail cone body 71, thereby effectively improving the reliability of the second guide vane 72 in use.

[0080] Among them, such as Figure 6 As shown, the axial length of the caudal vertebra body 71 is L. The connection point between the leading edge of the second guide vane 72 and the caudal vertebra body 71 is the first connection point. The shortest distance between the first connection point and the tip of the caudal vertebra body 71 is L1. The connection point between the trailing edge of the second guide vane 72 and the caudal vertebra body 71 is the second connection point. The shortest distance between the second connection point and the tip of the caudal vertebra body 71 is L2.

[0081] Optionally, L1 = (0.9~0.95)L. The value of L1 can be adaptively set according to the actual working conditions, such as 0.9L, 0.91L, 0.92L, 0.93L, 0.94L, or 0.95L. The range of L1 values ​​is an empirical range obtained from a large number of previous experiments.

[0082] Optionally, L2 = (0.2~0.3)L. The value of L2 can be adaptively set according to actual working conditions, such as 0.2L, 0.21L, 0.22L, 0.23L, 0.24L, 0.25L, 0.26L, 0.27L, 0.28L, 0.29L, or 0.3L, etc. The range of L2 values ​​is an empirical range obtained from numerous previous experiments.

[0083] In this embodiment, L1 is preferably (0.9~0.95)L and L2 is preferably (0.2~0.3)L.

[0084] By setting L1 = (0.9~0.95)L and L2 = (0.2~0.3)L, the length of the second guide vane 72 along the axial direction of the drive shaft 42 can be made longer while facilitating the installation of the second guide vane 72. This can further improve the guiding effect of the second guide vane 72 and further improve the propulsion efficiency and acoustic stealth performance of the water jet propulsion pump system. Secondly, while facilitating the installation of the second guide vane 72, the second guide vane 72 can be made as close as possible to the first guide vane 51 along the axial direction of the drive shaft 42. This can also further improve the guiding effect of the second guide vane 72 and further improve the propulsion efficiency and acoustic stealth performance of the water jet propulsion pump system.

[0085] Among them, such as Figure 6 As shown, for any one of the second guide vanes 72: the projection of the leading edge of the second guide vane 72 onto the preset plane is a first straight line; the projection of the trailing edge of the second guide vane 72 onto the preset plane is a second straight line; the projection of the connection between the second guide vane 72 and the tail cone body 71 onto the preset plane is a third straight line; any point on the mid-arc line of the airfoil of the tail cone body 71 and the airfoil of the second guide vane 72 forms the preset plane; the extension of the third straight line away from the leading edge of the second guide vane 72 is a fourth straight line. The angle between the first and third straight lines is θ1. The angle between the second and fourth straight lines is θ2. The contour line formed by the tail cone body 71 on the preset plane consists of two first straight lines intersecting at a fixed point; the angle between either straight line and the central axis of the tail cone body 71 is θ3. It can be understood that the central axis of the tail cone body 71 is collinear with the central axis of the drive shaft 42.

[0086] Optionally, θ2 ≤ θ1. Along the central axis of the tail cone body 71, the distance between the first and second connections is the first distance, and the distance between the highest point of the leading edge of the second guide vane 72 and the highest point of the trailing edge of the second guide vane 72 is the second distance. By setting θ2 ≤ θ1, making the first distance smaller than the second distance, the effect of the second guide vane 72 in eliminating the rotational component of the fluid can be further improved, thereby further increasing the pressure energy of the fluid ejected from the nozzle 3 and further improving the propulsion efficiency of the water jet propulsion pump system.

[0087] Optionally, 130°≤θ1≤140°. The value of θ1 can be adaptively set according to actual working conditions, such as 130°, 135°, or 140°. The range of θ1 is an empirical range obtained from a large number of previous experiments.

[0088] Optionally, 130°≤θ2≤140°. The value of θ2 can be adaptively set to 130°, 135°, or 140°, etc., according to actual working conditions. The range of θ2 is an empirical range obtained from a large number of previous experiments.

[0089] In this embodiment, it is preferable that θ2≤θ1, and 130°≤θ1≤140°, and 130°≤θ1≤140°. By setting θ2≤θ1, and 130°≤θ1≤140°, the projection of the leading edge of the second guide vane 72 on the preset plane can be as perpendicular as possible to the central axis of the drive shaft 42, thereby further improving the guiding effect of the second guide vane 72 and further improving the propulsion efficiency and acoustic stealth performance of the water jet propulsion pump system; secondly, this setting can also avoid interference between the second guide vane 72 and the first guide vane 51.

[0090] Further optionally, 85°≤θ1-θ3≤95°. This further ensures that the projection of the leading edge of the second guide vane 72 onto the preset plane is as perpendicular as possible to the central axis of the drive shaft 42, thereby further improving the guiding effect of the second guide vane 72 and further improving the propulsion efficiency and acoustic stealth performance of the water jet propulsion pump system; secondly, it further avoids interference between the second guide vane 72 and the first guide vane 51.

[0091] Alternatively, 40°≤θ3≤50°. The value of θ3 can be adaptively set to 40°, 45°, or 50°, etc., according to actual working conditions. The range of θ3 is an empirical range obtained from numerous previous experiments. This ensures that the tailbone body 71 has a good airflow guiding effect.

[0092] In this embodiment, it is preferable that 85°≤θ1-θ3≤95° and 40°≤θ3≤50°. This further enhances the effect of making the projection of the leading edge of the second guide vane 72 onto the preset plane as perpendicular as possible to the central axis of the drive shaft 42, thereby further improving the guiding effect of the second guide vane 72, further improving the propulsion efficiency and acoustic stealth performance of the water jet propulsion pump system, and effectively avoiding interference between the second guide vane 72 and the first guide vane 51.

[0093] Among them, such as Figure 1 As shown, the water jet propulsion pump system also includes an oil chamber 8 fixedly connected to the outer peripheral wall of the suction bend 1. The second end of the drive shaft 42 passes through the oil chamber 8 and is rotatably connected to the oil chamber 8 via a bearing 81. A lubricating oil cavity 82 is formed inside the oil chamber 8, and the lubricating oil in the lubricating oil cavity 82 is used to lubricate the bearing 81, etc., so that the drive shaft 42 can rotate smoothly around its own central axis.

[0094] Specifically, the water jet propulsion pump system further comprises a driving member, an output shaft of the driving member is in transmission connection with the second end of the driving shaft 42, and the driving member is configured to drive the driving shaft 42 to rotate around the central axis of the driving shaft 42. The driving member is a motor or the like. The transmission connection is a gear transmission assembly or a shaft coupling or the like.

[0095] Specifically, the specific structures of the liquid suction elbow 1, the liquid suction straight pipe 2, the jet pipe 3, the pump body 4, the guide vane structure 5, the tail vertebra body 71, the driving member and the transmission assembly all belong to the prior art, and thus will not be described here.

[0096] The application further provides a ship comprising the water jet propulsion pump system. By using the water jet propulsion pump system, the working performance of the ship can be effectively improved.

[0097] Obviously, the above embodiments of the application are merely exemplary and are not intended to limit the implementation modes of the application. Based on the above description, those skilled in the art can make other different forms of changes or modifications. It is unnecessary and impossible to enumerate all the implementation modes. Any modification, equivalent replacement and improvement within the spirit and principle of the application shall be included in the protection scope of the claims of the application.

Claims

1. A waterjet propulsion pump system, characterized by The water jet propulsion pump system comprises a suction bend (1), a suction straight pipe (2), a nozzle (3), a pump body (4) and a guide vane structure (5); the pump body (4) comprises a pump shell (41), a driving shaft (42) and an impeller (43) located in the pump shell (41), the suction bend (1), the suction straight pipe (2), the pump shell (41) and the nozzle (3) are sequentially communicated to form a fluid flow channel (6), the impeller (43) comprises a first body (431) and impeller blades (432) fixedly connected to the outer peripheral wall of the first body (431), the first body (431) is in transmission connection with the first end of the driving shaft (42), the second end of the driving shaft (42) extends out of the suction bend (1), and the driving shaft (42) is used for driving the impeller (43) to rotate around the central axis thereof; the guide vane structure (5) is located in the nozzle (3), the guide vane structure (5) comprises a first guide vane (51) and a second body (52) in rotational connection with the first body (431), the blade root of the first guide vane (51) is fixedly connected to the outer peripheral wall of the second body (52), the blade tip of the first guide vane (51) is fixedly connected to the inner peripheral wall of the nozzle (3), and the number of the first guide vane (51) and the number of the impeller blade (432) are co-prime; the water jet propulsion pump system further comprises a tail vertebra guide structure (7), the tail vertebra guide structure (7) comprises: a tail vertebra body (71) fixedly connected to the second body (52) and away from the first body (431) relative to the second body (52); at least two second guide vanes (72) fixedly connected to the outer peripheral wall of the tail vertebra body (71); along the circumference of the second body (52), one second guide vane (72) is distributed between any adjacent two first guide vanes (51).

2. The waterjet pump system of claim 1, wherein, The central axis of the driving shaft (42), the central axis of the suction straight pipe (2), the central axis of the pump shell (41) and the central axis of the nozzle (3) are collinear, the shortest distance from the highest point of the blade tail edge of the first guide vane (51) to the central axis of the driving shaft (42) is h; the shortest distance from the highest point of the blade leading edge of the second guide vane (72) to the central axis of the driving shaft (42) is h1, and h1=(0.55-0.7)h; and / or, the shortest distance from the highest point of the blade tail edge of the second guide vane (72) to the central axis of the driving shaft (42) is h2, and h2=(0.4-0.5)h.

3. The waterjet pump system of claim 1, wherein, The blade airfoil of the second guide vane (72) is a double-convex symmetric airfoil.

4. The waterjet pump system of claim 3, wherein, The blade wrap angle of the second guide vane (72) is α, and 0<α≤35°.

5. The water jet propulsion pump system according to claim 3, characterized in that: the inlet setting angle of the blade airfoil of the second guide vane (72) is β1, and 0°<β1≤30°; and / or, An outlet setting angle of the blade airfoil of the second guide vane (72) is β2, 0°<β2≤30°.

6. The waterjet pump system of any one of claims 1-5, wherein, A maximum thickness of the first guide vane (51) is d1, and a maximum thickness of the second guide vane (72) is d2, 0.5d1≤d2≤d1.

7. A waterjet propulsion pump system according to any one of claims 1-5, characterized in that An axial length of the tail vane body (71) is L; A first connecting position of the second guide vane (72) on a blade leading edge and connected with the tail vane body (71) is a first connecting position, a shortest distance between the first connecting position and a tip of the tail vane body (71) is L1, L1=(0.9-0.95)L; and / or, a second connecting position of the second guide vane (72) on a blade trailing edge and connected with the tail vane body (71) is a second connecting position, a shortest distance between the second connecting position and the tip of the tail vane body (71) is L2, L2=(0.2-0.3)L.

8. The waterjet propulsion pump system of any one of claims 1-5, wherein, For any one of the second guide vanes (72), a projection of a blade leading edge of the second guide vane (72) on a preset plane is a first straight line, a projection of a blade trailing edge of the second guide vane (72) on the preset plane is a second straight line, a projection of a connecting position of the second guide vane (72) and the tail vane body (71) on the preset plane is a third straight line, a center axis of the tail vane body (71) and any point on a camber line of the blade airfoil of the second guide vane (72) form the preset plane, the third straight line is away from a fourth straight line which is an extension line of the blade leading edge of the second guide vane (72), an included angle between the first straight line and the third straight line is θ1, an included angle between the second straight line and the fourth straight line is θ2, θ2≤θ1, 130°≤θ1≤140°, 130°≤θ2≤140°.

9. The waterjet pump system of claim 8, wherein, An outline of the tail vane body (71) formed on the preset plane is two first straight lines intersecting at a fixed point, an included angle between any one of the first straight lines and the center axis of the tail vane body (71) is θ3, 85°≤θ1-θ3≤95°.

10. A vessel characterised in that A water jet propulsion pump system comprising the water jet propulsion pump system according to any one of claims 1-9.

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